diff --git a/infoschema/cluster.go b/infoschema/cluster.go
index 8b4da69d1b88b..2bb5505ed76e6 100644
--- a/infoschema/cluster.go
+++ b/infoschema/cluster.go
@@ -40,7 +40,7 @@ var memTableToClusterTables = map[string]string{
 }
 
 func init() {
-	var addrCol = columnInfo{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil}
+	var addrCol = columnInfo{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64}
 	for memTableName, clusterMemTableName := range memTableToClusterTables {
 		memTableCols := tableNameToColumns[memTableName]
 		if len(memTableCols) == 0 {
diff --git a/infoschema/metrics_schema.go b/infoschema/metrics_schema.go
index 3411cc3373a71..49a57e4ac9eeb 100644
--- a/infoschema/metrics_schema.go
+++ b/infoschema/metrics_schema.go
@@ -84,16 +84,16 @@ func GetMetricTableDef(lowerTableName string) (*MetricTableDef, error) {
 
 func (def *MetricTableDef) genColumnInfos() []columnInfo {
 	cols := []columnInfo{
-		{"time", mysql.TypeDatetime, 19, 0, "CURRENT_TIMESTAMP", nil},
+		{name: "time", tp: mysql.TypeDatetime, size: 19, deflt: "CURRENT_TIMESTAMP"},
 	}
 	for _, label := range def.Labels {
-		cols = append(cols, columnInfo{label, mysql.TypeVarchar, 512, 0, nil, nil})
+		cols = append(cols, columnInfo{name: label, tp: mysql.TypeVarchar, size: 512})
 	}
 	if def.Quantile > 0 {
 		defaultValue := strconv.FormatFloat(def.Quantile, 'f', -1, 64)
-		cols = append(cols, columnInfo{"quantile", mysql.TypeDouble, 22, 0, defaultValue, nil})
+		cols = append(cols, columnInfo{name: "quantile", tp: mysql.TypeDouble, size: 22, deflt: defaultValue})
 	}
-	cols = append(cols, columnInfo{"value", mysql.TypeDouble, 22, 0, nil, nil})
+	cols = append(cols, columnInfo{name: "value", tp: mysql.TypeDouble, size: 22})
 	return cols
 }
 
diff --git a/infoschema/tables.go b/infoschema/tables.go
index 4ed5e213a4aff..66c585e25902f 100755
--- a/infoschema/tables.go
+++ b/infoschema/tables.go
@@ -181,12 +181,12 @@ var tableIDMap = map[string]int64{
 }
 
 type columnInfo struct {
-	name  string
-	tp    byte
-	size  int
-	flag  uint
-	deflt interface{}
-	elems []string
+	name    string
+	tp      byte
+	size    int
+	decimal int
+	flag    uint
+	deflt   interface{}
 }
 
 func buildColumnInfo(tableName string, col columnInfo) *model.ColumnInfo {
@@ -203,6 +203,7 @@ func buildColumnInfo(tableName string, col columnInfo) *model.ColumnInfo {
 		Collate: mCollation,
 		Tp:      col.tp,
 		Flen:    col.size,
+		Decimal: col.decimal,
 		Flag:    mFlag,
 	}
 	return &model.ColumnInfo{
@@ -230,616 +231,729 @@ func buildTableMeta(tableName string, cs []columnInfo) *model.TableInfo {
 }
 
 var schemataCols = []columnInfo{
-	{"CATALOG_NAME", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"SCHEMA_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DEFAULT_CHARACTER_SET_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DEFAULT_COLLATION_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"SQL_PATH", mysql.TypeVarchar, 512, 0, nil, nil},
+	{name: "CATALOG_NAME", tp: mysql.TypeVarchar, size: 512},
+	{name: "SCHEMA_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "DEFAULT_CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "DEFAULT_COLLATION_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "SQL_PATH", tp: mysql.TypeVarchar, size: 512},
 }
 
 var tablesCols = []columnInfo{
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"ENGINE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"VERSION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"ROW_FORMAT", mysql.TypeVarchar, 10, 0, nil, nil},
-	{"TABLE_ROWS", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"AVG_ROW_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATA_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"MAX_DATA_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"INDEX_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATA_FREE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"AUTO_INCREMENT", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CREATE_TIME", mysql.TypeDatetime, 19, 0, nil, nil},
-	{"UPDATE_TIME", mysql.TypeDatetime, 19, 0, nil, nil},
-	{"CHECK_TIME", mysql.TypeDatetime, 19, 0, nil, nil},
-	{"TABLE_COLLATION", mysql.TypeVarchar, 32, mysql.NotNullFlag, "utf8_bin", nil},
-	{"CHECKSUM", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CREATE_OPTIONS", mysql.TypeVarchar, 255, 0, nil, nil},
-	{"TABLE_COMMENT", mysql.TypeVarchar, 2048, 0, nil, nil},
-	{"TIDB_TABLE_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"TIDB_ROW_ID_SHARDING_INFO", mysql.TypeVarchar, 255, 0, nil, nil},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "ENGINE", tp: mysql.TypeVarchar, size: 64},
+	{name: "VERSION", tp: mysql.TypeLonglong, size: 21},
+	{name: "ROW_FORMAT", tp: mysql.TypeVarchar, size: 10},
+	{name: "TABLE_ROWS", tp: mysql.TypeLonglong, size: 21},
+	{name: "AVG_ROW_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATA_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "MAX_DATA_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "INDEX_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATA_FREE", tp: mysql.TypeLonglong, size: 21},
+	{name: "AUTO_INCREMENT", tp: mysql.TypeLonglong, size: 21},
+	{name: "CREATE_TIME", tp: mysql.TypeDatetime, size: 19},
+	{name: "UPDATE_TIME", tp: mysql.TypeDatetime, size: 19},
+	{name: "CHECK_TIME", tp: mysql.TypeDatetime, size: 19},
+	{name: "TABLE_COLLATION", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag, deflt: "utf8_bin"},
+	{name: "CHECKSUM", tp: mysql.TypeLonglong, size: 21},
+	{name: "CREATE_OPTIONS", tp: mysql.TypeVarchar, size: 255},
+	{name: "TABLE_COMMENT", tp: mysql.TypeVarchar, size: 2048},
+	{name: "TIDB_TABLE_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "TIDB_ROW_ID_SHARDING_INFO", tp: mysql.TypeVarchar, size: 255},
 }
 
 // See: http://dev.mysql.com/doc/refman/5.7/en/columns-table.html
 var columnsCols = []columnInfo{
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"COLUMN_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"ORDINAL_POSITION", mysql.TypeLonglong, 64, 0, nil, nil},
-	{"COLUMN_DEFAULT", mysql.TypeBlob, 196606, 0, nil, nil},
-	{"IS_NULLABLE", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"DATA_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"CHARACTER_MAXIMUM_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CHARACTER_OCTET_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"NUMERIC_PRECISION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"NUMERIC_SCALE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATETIME_PRECISION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CHARACTER_SET_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"COLLATION_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"COLUMN_TYPE", mysql.TypeBlob, 196606, 0, nil, nil},
-	{"COLUMN_KEY", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"EXTRA", mysql.TypeVarchar, 30, 0, nil, nil},
-	{"PRIVILEGES", mysql.TypeVarchar, 80, 0, nil, nil},
-	{"COLUMN_COMMENT", mysql.TypeVarchar, 1024, 0, nil, nil},
-	{"GENERATION_EXPRESSION", mysql.TypeBlob, 589779, mysql.NotNullFlag, nil, nil},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "COLUMN_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "ORDINAL_POSITION", tp: mysql.TypeLonglong, size: 64},
+	{name: "COLUMN_DEFAULT", tp: mysql.TypeBlob, size: 196606},
+	{name: "IS_NULLABLE", tp: mysql.TypeVarchar, size: 3},
+	{name: "DATA_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "CHARACTER_MAXIMUM_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "CHARACTER_OCTET_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "NUMERIC_PRECISION", tp: mysql.TypeLonglong, size: 21},
+	{name: "NUMERIC_SCALE", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATETIME_PRECISION", tp: mysql.TypeLonglong, size: 21},
+	{name: "CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "COLLATION_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "COLUMN_TYPE", tp: mysql.TypeBlob, size: 196606},
+	{name: "COLUMN_KEY", tp: mysql.TypeVarchar, size: 3},
+	{name: "EXTRA", tp: mysql.TypeVarchar, size: 30},
+	{name: "PRIVILEGES", tp: mysql.TypeVarchar, size: 80},
+	{name: "COLUMN_COMMENT", tp: mysql.TypeVarchar, size: 1024},
+	{name: "GENERATION_EXPRESSION", tp: mysql.TypeBlob, size: 589779, flag: mysql.NotNullFlag},
 }
 
 var columnStatisticsCols = []columnInfo{
-	{"SCHEMA_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"COLUMN_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"HISTOGRAM", mysql.TypeJSON, 51, 0, nil, nil},
+	{name: "SCHEMA_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "COLUMN_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "HISTOGRAM", tp: mysql.TypeJSON, size: 51},
 }
 
 var statisticsCols = []columnInfo{
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"NON_UNIQUE", mysql.TypeVarchar, 1, 0, nil, nil},
-	{"INDEX_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INDEX_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SEQ_IN_INDEX", mysql.TypeLonglong, 2, 0, nil, nil},
-	{"COLUMN_NAME", mysql.TypeVarchar, 21, 0, nil, nil},
-	{"COLLATION", mysql.TypeVarchar, 1, 0, nil, nil},
-	{"CARDINALITY", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"SUB_PART", mysql.TypeLonglong, 3, 0, nil, nil},
-	{"PACKED", mysql.TypeVarchar, 10, 0, nil, nil},
-	{"NULLABLE", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"INDEX_TYPE", mysql.TypeVarchar, 16, 0, nil, nil},
-	{"COMMENT", mysql.TypeVarchar, 16, 0, nil, nil},
-	{"Expression", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INDEX_COMMENT", mysql.TypeVarchar, 1024, 0, nil, nil},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "NON_UNIQUE", tp: mysql.TypeVarchar, size: 1},
+	{name: "INDEX_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "INDEX_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "SEQ_IN_INDEX", tp: mysql.TypeLonglong, size: 2},
+	{name: "COLUMN_NAME", tp: mysql.TypeVarchar, size: 21},
+	{name: "COLLATION", tp: mysql.TypeVarchar, size: 1},
+	{name: "CARDINALITY", tp: mysql.TypeLonglong, size: 21},
+	{name: "SUB_PART", tp: mysql.TypeLonglong, size: 3},
+	{name: "PACKED", tp: mysql.TypeVarchar, size: 10},
+	{name: "NULLABLE", tp: mysql.TypeVarchar, size: 3},
+	{name: "INDEX_TYPE", tp: mysql.TypeVarchar, size: 16},
+	{name: "COMMENT", tp: mysql.TypeVarchar, size: 16},
+	{name: "Expression", tp: mysql.TypeVarchar, size: 64},
+	{name: "INDEX_COMMENT", tp: mysql.TypeVarchar, size: 1024},
 }
 
 var profilingCols = []columnInfo{
-	{"QUERY_ID", mysql.TypeLong, 20, 0, nil, nil},
-	{"SEQ", mysql.TypeLong, 20, 0, nil, nil},
-	{"STATE", mysql.TypeVarchar, 30, 0, nil, nil},
-	{"DURATION", mysql.TypeNewDecimal, 9, 0, nil, nil},
-	{"CPU_USER", mysql.TypeNewDecimal, 9, 0, nil, nil},
-	{"CPU_SYSTEM", mysql.TypeNewDecimal, 9, 0, nil, nil},
-	{"CONTEXT_VOLUNTARY", mysql.TypeLong, 20, 0, nil, nil},
-	{"CONTEXT_INVOLUNTARY", mysql.TypeLong, 20, 0, nil, nil},
-	{"BLOCK_OPS_IN", mysql.TypeLong, 20, 0, nil, nil},
-	{"BLOCK_OPS_OUT", mysql.TypeLong, 20, 0, nil, nil},
-	{"MESSAGES_SENT", mysql.TypeLong, 20, 0, nil, nil},
-	{"MESSAGES_RECEIVED", mysql.TypeLong, 20, 0, nil, nil},
-	{"PAGE_FAULTS_MAJOR", mysql.TypeLong, 20, 0, nil, nil},
-	{"PAGE_FAULTS_MINOR", mysql.TypeLong, 20, 0, nil, nil},
-	{"SWAPS", mysql.TypeLong, 20, 0, nil, nil},
-	{"SOURCE_FUNCTION", mysql.TypeVarchar, 30, 0, nil, nil},
-	{"SOURCE_FILE", mysql.TypeVarchar, 20, 0, nil, nil},
-	{"SOURCE_LINE", mysql.TypeLong, 20, 0, nil, nil},
+	{name: "QUERY_ID", tp: mysql.TypeLong, size: 20},
+	{name: "SEQ", tp: mysql.TypeLong, size: 20},
+	{name: "STATE", tp: mysql.TypeVarchar, size: 30},
+	{name: "DURATION", tp: mysql.TypeNewDecimal, size: 9},
+	{name: "CPU_USER", tp: mysql.TypeNewDecimal, size: 9},
+	{name: "CPU_SYSTEM", tp: mysql.TypeNewDecimal, size: 9},
+	{name: "CONTEXT_VOLUNTARY", tp: mysql.TypeLong, size: 20},
+	{name: "CONTEXT_INVOLUNTARY", tp: mysql.TypeLong, size: 20},
+	{name: "BLOCK_OPS_IN", tp: mysql.TypeLong, size: 20},
+	{name: "BLOCK_OPS_OUT", tp: mysql.TypeLong, size: 20},
+	{name: "MESSAGES_SENT", tp: mysql.TypeLong, size: 20},
+	{name: "MESSAGES_RECEIVED", tp: mysql.TypeLong, size: 20},
+	{name: "PAGE_FAULTS_MAJOR", tp: mysql.TypeLong, size: 20},
+	{name: "PAGE_FAULTS_MINOR", tp: mysql.TypeLong, size: 20},
+	{name: "SWAPS", tp: mysql.TypeLong, size: 20},
+	{name: "SOURCE_FUNCTION", tp: mysql.TypeVarchar, size: 30},
+	{name: "SOURCE_FILE", tp: mysql.TypeVarchar, size: 20},
+	{name: "SOURCE_LINE", tp: mysql.TypeLong, size: 20},
 }
 
 var charsetCols = []columnInfo{
-	{"CHARACTER_SET_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"DEFAULT_COLLATE_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"DESCRIPTION", mysql.TypeVarchar, 60, 0, nil, nil},
-	{"MAXLEN", mysql.TypeLonglong, 3, 0, nil, nil},
+	{name: "CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "DEFAULT_COLLATE_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "DESCRIPTION", tp: mysql.TypeVarchar, size: 60},
+	{name: "MAXLEN", tp: mysql.TypeLonglong, size: 3},
 }
 
 var collationsCols = []columnInfo{
-	{"COLLATION_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"CHARACTER_SET_NAME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"ID", mysql.TypeLonglong, 11, 0, nil, nil},
-	{"IS_DEFAULT", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"IS_COMPILED", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"SORTLEN", mysql.TypeLonglong, 3, 0, nil, nil},
+	{name: "COLLATION_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 32},
+	{name: "ID", tp: mysql.TypeLonglong, size: 11},
+	{name: "IS_DEFAULT", tp: mysql.TypeVarchar, size: 3},
+	{name: "IS_COMPILED", tp: mysql.TypeVarchar, size: 3},
+	{name: "SORTLEN", tp: mysql.TypeLonglong, size: 3},
 }
 
 var keyColumnUsageCols = []columnInfo{
-	{"CONSTRAINT_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"CONSTRAINT_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"CONSTRAINT_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"COLUMN_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"ORDINAL_POSITION", mysql.TypeLonglong, 10, mysql.NotNullFlag, nil, nil},
-	{"POSITION_IN_UNIQUE_CONSTRAINT", mysql.TypeLonglong, 10, 0, nil, nil},
-	{"REFERENCED_TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"REFERENCED_TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"REFERENCED_COLUMN_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "CONSTRAINT_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "CONSTRAINT_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "CONSTRAINT_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "COLUMN_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "ORDINAL_POSITION", tp: mysql.TypeLonglong, size: 10, flag: mysql.NotNullFlag},
+	{name: "POSITION_IN_UNIQUE_CONSTRAINT", tp: mysql.TypeLonglong, size: 10},
+	{name: "REFERENCED_TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "REFERENCED_TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "REFERENCED_COLUMN_NAME", tp: mysql.TypeVarchar, size: 64},
 }
 
 // See http://dev.mysql.com/doc/refman/5.7/en/referential-constraints-table.html
 var referConstCols = []columnInfo{
-	{"CONSTRAINT_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"CONSTRAINT_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"CONSTRAINT_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"UNIQUE_CONSTRAINT_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"UNIQUE_CONSTRAINT_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"UNIQUE_CONSTRAINT_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"MATCH_OPTION", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"UPDATE_RULE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"DELETE_RULE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"REFERENCED_TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
+	{name: "CONSTRAINT_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "CONSTRAINT_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "CONSTRAINT_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "UNIQUE_CONSTRAINT_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "UNIQUE_CONSTRAINT_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "UNIQUE_CONSTRAINT_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "MATCH_OPTION", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "UPDATE_RULE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "DELETE_RULE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "REFERENCED_TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
 }
 
 // See http://dev.mysql.com/doc/refman/5.7/en/variables-table.html
 var sessionVarCols = []columnInfo{
-	{"VARIABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"VARIABLE_VALUE", mysql.TypeVarchar, 1024, 0, nil, nil},
+	{name: "VARIABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "VARIABLE_VALUE", tp: mysql.TypeVarchar, size: 1024},
 }
 
 // See https://dev.mysql.com/doc/refman/5.7/en/plugins-table.html
 var pluginsCols = []columnInfo{
-	{"PLUGIN_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PLUGIN_VERSION", mysql.TypeVarchar, 20, 0, nil, nil},
-	{"PLUGIN_STATUS", mysql.TypeVarchar, 10, 0, nil, nil},
-	{"PLUGIN_TYPE", mysql.TypeVarchar, 80, 0, nil, nil},
-	{"PLUGIN_TYPE_VERSION", mysql.TypeVarchar, 20, 0, nil, nil},
-	{"PLUGIN_LIBRARY", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PLUGIN_LIBRARY_VERSION", mysql.TypeVarchar, 20, 0, nil, nil},
-	{"PLUGIN_AUTHOR", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PLUGIN_DESCRIPTION", mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
-	{"PLUGIN_LICENSE", mysql.TypeVarchar, 80, 0, nil, nil},
-	{"LOAD_OPTION", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "PLUGIN_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "PLUGIN_VERSION", tp: mysql.TypeVarchar, size: 20},
+	{name: "PLUGIN_STATUS", tp: mysql.TypeVarchar, size: 10},
+	{name: "PLUGIN_TYPE", tp: mysql.TypeVarchar, size: 80},
+	{name: "PLUGIN_TYPE_VERSION", tp: mysql.TypeVarchar, size: 20},
+	{name: "PLUGIN_LIBRARY", tp: mysql.TypeVarchar, size: 64},
+	{name: "PLUGIN_LIBRARY_VERSION", tp: mysql.TypeVarchar, size: 20},
+	{name: "PLUGIN_AUTHOR", tp: mysql.TypeVarchar, size: 64},
+	{name: "PLUGIN_DESCRIPTION", tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
+	{name: "PLUGIN_LICENSE", tp: mysql.TypeVarchar, size: 80},
+	{name: "LOAD_OPTION", tp: mysql.TypeVarchar, size: 64},
 }
 
 // See https://dev.mysql.com/doc/refman/5.7/en/partitions-table.html
 var partitionsCols = []columnInfo{
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PARTITION_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SUBPARTITION_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PARTITION_ORDINAL_POSITION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"SUBPARTITION_ORDINAL_POSITION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"PARTITION_METHOD", mysql.TypeVarchar, 18, 0, nil, nil},
-	{"SUBPARTITION_METHOD", mysql.TypeVarchar, 12, 0, nil, nil},
-	{"PARTITION_EXPRESSION", mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
-	{"SUBPARTITION_EXPRESSION", mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
-	{"PARTITION_DESCRIPTION", mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
-	{"TABLE_ROWS", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"AVG_ROW_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATA_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"MAX_DATA_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"INDEX_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATA_FREE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CREATE_TIME", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"UPDATE_TIME", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"CHECK_TIME", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"CHECKSUM", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"PARTITION_COMMENT", mysql.TypeVarchar, 80, 0, nil, nil},
-	{"NODEGROUP", mysql.TypeVarchar, 12, 0, nil, nil},
-	{"TABLESPACE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "PARTITION_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "SUBPARTITION_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "PARTITION_ORDINAL_POSITION", tp: mysql.TypeLonglong, size: 21},
+	{name: "SUBPARTITION_ORDINAL_POSITION", tp: mysql.TypeLonglong, size: 21},
+	{name: "PARTITION_METHOD", tp: mysql.TypeVarchar, size: 18},
+	{name: "SUBPARTITION_METHOD", tp: mysql.TypeVarchar, size: 12},
+	{name: "PARTITION_EXPRESSION", tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
+	{name: "SUBPARTITION_EXPRESSION", tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
+	{name: "PARTITION_DESCRIPTION", tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
+	{name: "TABLE_ROWS", tp: mysql.TypeLonglong, size: 21},
+	{name: "AVG_ROW_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATA_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "MAX_DATA_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "INDEX_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATA_FREE", tp: mysql.TypeLonglong, size: 21},
+	{name: "CREATE_TIME", tp: mysql.TypeDatetime},
+	{name: "UPDATE_TIME", tp: mysql.TypeDatetime},
+	{name: "CHECK_TIME", tp: mysql.TypeDatetime},
+	{name: "CHECKSUM", tp: mysql.TypeLonglong, size: 21},
+	{name: "PARTITION_COMMENT", tp: mysql.TypeVarchar, size: 80},
+	{name: "NODEGROUP", tp: mysql.TypeVarchar, size: 12},
+	{name: "TABLESPACE_NAME", tp: mysql.TypeVarchar, size: 64},
 }
 
 var tableConstraintsCols = []columnInfo{
-	{"CONSTRAINT_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"CONSTRAINT_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"CONSTRAINT_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"CONSTRAINT_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "CONSTRAINT_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "CONSTRAINT_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "CONSTRAINT_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "CONSTRAINT_TYPE", tp: mysql.TypeVarchar, size: 64},
 }
 
 var tableTriggersCols = []columnInfo{
-	{"TRIGGER_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"TRIGGER_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TRIGGER_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"EVENT_MANIPULATION", mysql.TypeVarchar, 6, 0, nil, nil},
-	{"EVENT_OBJECT_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"EVENT_OBJECT_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"EVENT_OBJECT_TABLE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"ACTION_ORDER", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"ACTION_CONDITION", mysql.TypeBlob, -1, 0, nil, nil},
-	{"ACTION_STATEMENT", mysql.TypeBlob, -1, 0, nil, nil},
-	{"ACTION_ORIENTATION", mysql.TypeVarchar, 9, 0, nil, nil},
-	{"ACTION_TIMING", mysql.TypeVarchar, 6, 0, nil, nil},
-	{"ACTION_REFERENCE_OLD_TABLE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"ACTION_REFERENCE_NEW_TABLE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"ACTION_REFERENCE_OLD_ROW", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"ACTION_REFERENCE_NEW_ROW", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"CREATED", mysql.TypeDatetime, 2, 0, nil, nil},
-	{"SQL_MODE", mysql.TypeVarchar, 8192, 0, nil, nil},
-	{"DEFINER", mysql.TypeVarchar, 77, 0, nil, nil},
-	{"CHARACTER_SET_CLIENT", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"COLLATION_CONNECTION", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"DATABASE_COLLATION", mysql.TypeVarchar, 32, 0, nil, nil},
+	{name: "TRIGGER_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "TRIGGER_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TRIGGER_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "EVENT_MANIPULATION", tp: mysql.TypeVarchar, size: 6},
+	{name: "EVENT_OBJECT_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "EVENT_OBJECT_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "EVENT_OBJECT_TABLE", tp: mysql.TypeVarchar, size: 64},
+	{name: "ACTION_ORDER", tp: mysql.TypeLonglong, size: 4},
+	{name: "ACTION_CONDITION", tp: mysql.TypeBlob, size: -1},
+	{name: "ACTION_STATEMENT", tp: mysql.TypeBlob, size: -1},
+	{name: "ACTION_ORIENTATION", tp: mysql.TypeVarchar, size: 9},
+	{name: "ACTION_TIMING", tp: mysql.TypeVarchar, size: 6},
+	{name: "ACTION_REFERENCE_OLD_TABLE", tp: mysql.TypeVarchar, size: 64},
+	{name: "ACTION_REFERENCE_NEW_TABLE", tp: mysql.TypeVarchar, size: 64},
+	{name: "ACTION_REFERENCE_OLD_ROW", tp: mysql.TypeVarchar, size: 3},
+	{name: "ACTION_REFERENCE_NEW_ROW", tp: mysql.TypeVarchar, size: 3},
+	{name: "CREATED", tp: mysql.TypeDatetime, size: 2},
+	{name: "SQL_MODE", tp: mysql.TypeVarchar, size: 8192},
+	{name: "DEFINER", tp: mysql.TypeVarchar, size: 77},
+	{name: "CHARACTER_SET_CLIENT", tp: mysql.TypeVarchar, size: 32},
+	{name: "COLLATION_CONNECTION", tp: mysql.TypeVarchar, size: 32},
+	{name: "DATABASE_COLLATION", tp: mysql.TypeVarchar, size: 32},
 }
 
 var tableUserPrivilegesCols = []columnInfo{
-	{"GRANTEE", mysql.TypeVarchar, 81, 0, nil, nil},
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, 0, nil, nil},
-	{"PRIVILEGE_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"IS_GRANTABLE", mysql.TypeVarchar, 3, 0, nil, nil},
+	{name: "GRANTEE", tp: mysql.TypeVarchar, size: 81},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512},
+	{name: "PRIVILEGE_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "IS_GRANTABLE", tp: mysql.TypeVarchar, size: 3},
 }
 
 var tableSchemaPrivilegesCols = []columnInfo{
-	{"GRANTEE", mysql.TypeVarchar, 81, mysql.NotNullFlag, nil, nil},
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"PRIVILEGE_TYPE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"IS_GRANTABLE", mysql.TypeVarchar, 3, mysql.NotNullFlag, nil, nil},
+	{name: "GRANTEE", tp: mysql.TypeVarchar, size: 81, flag: mysql.NotNullFlag},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "PRIVILEGE_TYPE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "IS_GRANTABLE", tp: mysql.TypeVarchar, size: 3, flag: mysql.NotNullFlag},
 }
 
 var tableTablePrivilegesCols = []columnInfo{
-	{"GRANTEE", mysql.TypeVarchar, 81, mysql.NotNullFlag, nil, nil},
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"PRIVILEGE_TYPE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"IS_GRANTABLE", mysql.TypeVarchar, 3, mysql.NotNullFlag, nil, nil},
+	{name: "GRANTEE", tp: mysql.TypeVarchar, size: 81, flag: mysql.NotNullFlag},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "PRIVILEGE_TYPE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "IS_GRANTABLE", tp: mysql.TypeVarchar, size: 3, flag: mysql.NotNullFlag},
 }
 
 var tableColumnPrivilegesCols = []columnInfo{
-	{"GRANTEE", mysql.TypeVarchar, 81, mysql.NotNullFlag, nil, nil},
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"COLUMN_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"PRIVILEGE_TYPE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"IS_GRANTABLE", mysql.TypeVarchar, 3, mysql.NotNullFlag, nil, nil},
+	{name: "GRANTEE", tp: mysql.TypeVarchar, size: 81, flag: mysql.NotNullFlag},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "COLUMN_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "PRIVILEGE_TYPE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "IS_GRANTABLE", tp: mysql.TypeVarchar, size: 3, flag: mysql.NotNullFlag},
 }
 
 var tableEnginesCols = []columnInfo{
-	{"ENGINE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SUPPORT", mysql.TypeVarchar, 8, 0, nil, nil},
-	{"COMMENT", mysql.TypeVarchar, 80, 0, nil, nil},
-	{"TRANSACTIONS", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"XA", mysql.TypeVarchar, 3, 0, nil, nil},
-	{"SAVEPOINTS", mysql.TypeVarchar, 3, 0, nil, nil},
+	{name: "ENGINE", tp: mysql.TypeVarchar, size: 64},
+	{name: "SUPPORT", tp: mysql.TypeVarchar, size: 8},
+	{name: "COMMENT", tp: mysql.TypeVarchar, size: 80},
+	{name: "TRANSACTIONS", tp: mysql.TypeVarchar, size: 3},
+	{name: "XA", tp: mysql.TypeVarchar, size: 3},
+	{name: "SAVEPOINTS", tp: mysql.TypeVarchar, size: 3},
 }
 
 var tableViewsCols = []columnInfo{
-	{"TABLE_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"VIEW_DEFINITION", mysql.TypeLongBlob, 0, mysql.NotNullFlag, nil, nil},
-	{"CHECK_OPTION", mysql.TypeVarchar, 8, mysql.NotNullFlag, nil, nil},
-	{"IS_UPDATABLE", mysql.TypeVarchar, 3, mysql.NotNullFlag, nil, nil},
-	{"DEFINER", mysql.TypeVarchar, 77, mysql.NotNullFlag, nil, nil},
-	{"SECURITY_TYPE", mysql.TypeVarchar, 7, mysql.NotNullFlag, nil, nil},
-	{"CHARACTER_SET_CLIENT", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
-	{"COLLATION_CONNECTION", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "VIEW_DEFINITION", tp: mysql.TypeLongBlob, flag: mysql.NotNullFlag},
+	{name: "CHECK_OPTION", tp: mysql.TypeVarchar, size: 8, flag: mysql.NotNullFlag},
+	{name: "IS_UPDATABLE", tp: mysql.TypeVarchar, size: 3, flag: mysql.NotNullFlag},
+	{name: "DEFINER", tp: mysql.TypeVarchar, size: 77, flag: mysql.NotNullFlag},
+	{name: "SECURITY_TYPE", tp: mysql.TypeVarchar, size: 7, flag: mysql.NotNullFlag},
+	{name: "CHARACTER_SET_CLIENT", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
+	{name: "COLLATION_CONNECTION", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
 }
 
 var tableRoutinesCols = []columnInfo{
-	{"SPECIFIC_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_TYPE", mysql.TypeVarchar, 9, mysql.NotNullFlag, nil, nil},
-	{"DATA_TYPE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"CHARACTER_MAXIMUM_LENGTH", mysql.TypeLong, 21, 0, nil, nil},
-	{"CHARACTER_OCTET_LENGTH", mysql.TypeLong, 21, 0, nil, nil},
-	{"NUMERIC_PRECISION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"NUMERIC_SCALE", mysql.TypeLong, 21, 0, nil, nil},
-	{"DATETIME_PRECISION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CHARACTER_SET_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"COLLATION_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DTD_IDENTIFIER", mysql.TypeLongBlob, 0, 0, nil, nil},
-	{"ROUTINE_BODY", mysql.TypeVarchar, 8, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_DEFINITION", mysql.TypeLongBlob, 0, 0, nil, nil},
-	{"EXTERNAL_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"EXTERNAL_LANGUAGE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PARAMETER_STYLE", mysql.TypeVarchar, 8, mysql.NotNullFlag, nil, nil},
-	{"IS_DETERMINISTIC", mysql.TypeVarchar, 3, mysql.NotNullFlag, nil, nil},
-	{"SQL_DATA_ACCESS", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"SQL_PATH", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SECURITY_TYPE", mysql.TypeVarchar, 7, mysql.NotNullFlag, nil, nil},
-	{"CREATED", mysql.TypeDatetime, 0, mysql.NotNullFlag, "0000-00-00 00:00:00", nil},
-	{"LAST_ALTERED", mysql.TypeDatetime, 0, mysql.NotNullFlag, "0000-00-00 00:00:00", nil},
-	{"SQL_MODE", mysql.TypeVarchar, 8192, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_COMMENT", mysql.TypeLongBlob, 0, 0, nil, nil},
-	{"DEFINER", mysql.TypeVarchar, 77, mysql.NotNullFlag, nil, nil},
-	{"CHARACTER_SET_CLIENT", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
-	{"COLLATION_CONNECTION", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
-	{"DATABASE_COLLATION", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
+	{name: "SPECIFIC_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_TYPE", tp: mysql.TypeVarchar, size: 9, flag: mysql.NotNullFlag},
+	{name: "DATA_TYPE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "CHARACTER_MAXIMUM_LENGTH", tp: mysql.TypeLong, size: 21},
+	{name: "CHARACTER_OCTET_LENGTH", tp: mysql.TypeLong, size: 21},
+	{name: "NUMERIC_PRECISION", tp: mysql.TypeLonglong, size: 21},
+	{name: "NUMERIC_SCALE", tp: mysql.TypeLong, size: 21},
+	{name: "DATETIME_PRECISION", tp: mysql.TypeLonglong, size: 21},
+	{name: "CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "COLLATION_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "DTD_IDENTIFIER", tp: mysql.TypeLongBlob},
+	{name: "ROUTINE_BODY", tp: mysql.TypeVarchar, size: 8, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_DEFINITION", tp: mysql.TypeLongBlob},
+	{name: "EXTERNAL_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "EXTERNAL_LANGUAGE", tp: mysql.TypeVarchar, size: 64},
+	{name: "PARAMETER_STYLE", tp: mysql.TypeVarchar, size: 8, flag: mysql.NotNullFlag},
+	{name: "IS_DETERMINISTIC", tp: mysql.TypeVarchar, size: 3, flag: mysql.NotNullFlag},
+	{name: "SQL_DATA_ACCESS", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "SQL_PATH", tp: mysql.TypeVarchar, size: 64},
+	{name: "SECURITY_TYPE", tp: mysql.TypeVarchar, size: 7, flag: mysql.NotNullFlag},
+	{name: "CREATED", tp: mysql.TypeDatetime, flag: mysql.NotNullFlag, deflt: "0000-00-00 00:00:00"},
+	{name: "LAST_ALTERED", tp: mysql.TypeDatetime, flag: mysql.NotNullFlag, deflt: "0000-00-00 00:00:00"},
+	{name: "SQL_MODE", tp: mysql.TypeVarchar, size: 8192, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_COMMENT", tp: mysql.TypeLongBlob},
+	{name: "DEFINER", tp: mysql.TypeVarchar, size: 77, flag: mysql.NotNullFlag},
+	{name: "CHARACTER_SET_CLIENT", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
+	{name: "COLLATION_CONNECTION", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
+	{name: "DATABASE_COLLATION", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
 }
 
 var tableParametersCols = []columnInfo{
-	{"SPECIFIC_CATALOG", mysql.TypeVarchar, 512, mysql.NotNullFlag, nil, nil},
-	{"SPECIFIC_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"SPECIFIC_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"ORDINAL_POSITION", mysql.TypeVarchar, 21, mysql.NotNullFlag, nil, nil},
-	{"PARAMETER_MODE", mysql.TypeVarchar, 5, 0, nil, nil},
-	{"PARAMETER_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DATA_TYPE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"CHARACTER_MAXIMUM_LENGTH", mysql.TypeVarchar, 21, 0, nil, nil},
-	{"CHARACTER_OCTET_LENGTH", mysql.TypeVarchar, 21, 0, nil, nil},
-	{"NUMERIC_PRECISION", mysql.TypeVarchar, 21, 0, nil, nil},
-	{"NUMERIC_SCALE", mysql.TypeVarchar, 21, 0, nil, nil},
-	{"DATETIME_PRECISION", mysql.TypeVarchar, 21, 0, nil, nil},
-	{"CHARACTER_SET_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"COLLATION_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DTD_IDENTIFIER", mysql.TypeLongBlob, 0, mysql.NotNullFlag, nil, nil},
-	{"ROUTINE_TYPE", mysql.TypeVarchar, 9, mysql.NotNullFlag, nil, nil},
+	{name: "SPECIFIC_CATALOG", tp: mysql.TypeVarchar, size: 512, flag: mysql.NotNullFlag},
+	{name: "SPECIFIC_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "SPECIFIC_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "ORDINAL_POSITION", tp: mysql.TypeVarchar, size: 21, flag: mysql.NotNullFlag},
+	{name: "PARAMETER_MODE", tp: mysql.TypeVarchar, size: 5},
+	{name: "PARAMETER_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "DATA_TYPE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "CHARACTER_MAXIMUM_LENGTH", tp: mysql.TypeVarchar, size: 21},
+	{name: "CHARACTER_OCTET_LENGTH", tp: mysql.TypeVarchar, size: 21},
+	{name: "NUMERIC_PRECISION", tp: mysql.TypeVarchar, size: 21},
+	{name: "NUMERIC_SCALE", tp: mysql.TypeVarchar, size: 21},
+	{name: "DATETIME_PRECISION", tp: mysql.TypeVarchar, size: 21},
+	{name: "CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "COLLATION_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "DTD_IDENTIFIER", tp: mysql.TypeLongBlob, flag: mysql.NotNullFlag},
+	{name: "ROUTINE_TYPE", tp: mysql.TypeVarchar, size: 9, flag: mysql.NotNullFlag},
 }
 
 var tableEventsCols = []columnInfo{
-	{"EVENT_CATALOG", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"EVENT_SCHEMA", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"EVENT_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"DEFINER", mysql.TypeVarchar, 77, mysql.NotNullFlag, nil, nil},
-	{"TIME_ZONE", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"EVENT_BODY", mysql.TypeVarchar, 8, mysql.NotNullFlag, nil, nil},
-	{"EVENT_DEFINITION", mysql.TypeLongBlob, 0, 0, nil, nil},
-	{"EVENT_TYPE", mysql.TypeVarchar, 9, mysql.NotNullFlag, nil, nil},
-	{"EXECUTE_AT", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"INTERVAL_VALUE", mysql.TypeVarchar, 256, 0, nil, nil},
-	{"INTERVAL_FIELD", mysql.TypeVarchar, 18, 0, nil, nil},
-	{"SQL_MODE", mysql.TypeVarchar, 8192, mysql.NotNullFlag, nil, nil},
-	{"STARTS", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"ENDS", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"STATUS", mysql.TypeVarchar, 18, mysql.NotNullFlag, nil, nil},
-	{"ON_COMPLETION", mysql.TypeVarchar, 12, mysql.NotNullFlag, nil, nil},
-	{"CREATED", mysql.TypeDatetime, 0, mysql.NotNullFlag, "0000-00-00 00:00:00", nil},
-	{"LAST_ALTERED", mysql.TypeDatetime, 0, mysql.NotNullFlag, "0000-00-00 00:00:00", nil},
-	{"LAST_EXECUTED", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"EVENT_COMMENT", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"ORIGINATOR", mysql.TypeLong, 10, mysql.NotNullFlag, 0, nil},
-	{"CHARACTER_SET_CLIENT", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
-	{"COLLATION_CONNECTION", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
-	{"DATABASE_COLLATION", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
+	{name: "EVENT_CATALOG", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "EVENT_SCHEMA", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "EVENT_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "DEFINER", tp: mysql.TypeVarchar, size: 77, flag: mysql.NotNullFlag},
+	{name: "TIME_ZONE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "EVENT_BODY", tp: mysql.TypeVarchar, size: 8, flag: mysql.NotNullFlag},
+	{name: "EVENT_DEFINITION", tp: mysql.TypeLongBlob},
+	{name: "EVENT_TYPE", tp: mysql.TypeVarchar, size: 9, flag: mysql.NotNullFlag},
+	{name: "EXECUTE_AT", tp: mysql.TypeDatetime},
+	{name: "INTERVAL_VALUE", tp: mysql.TypeVarchar, size: 256},
+	{name: "INTERVAL_FIELD", tp: mysql.TypeVarchar, size: 18},
+	{name: "SQL_MODE", tp: mysql.TypeVarchar, size: 8192, flag: mysql.NotNullFlag},
+	{name: "STARTS", tp: mysql.TypeDatetime},
+	{name: "ENDS", tp: mysql.TypeDatetime},
+	{name: "STATUS", tp: mysql.TypeVarchar, size: 18, flag: mysql.NotNullFlag},
+	{name: "ON_COMPLETION", tp: mysql.TypeVarchar, size: 12, flag: mysql.NotNullFlag},
+	{name: "CREATED", tp: mysql.TypeDatetime, flag: mysql.NotNullFlag, deflt: "0000-00-00 00:00:00"},
+	{name: "LAST_ALTERED", tp: mysql.TypeDatetime, flag: mysql.NotNullFlag, deflt: "0000-00-00 00:00:00"},
+	{name: "LAST_EXECUTED", tp: mysql.TypeDatetime},
+	{name: "EVENT_COMMENT", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "ORIGINATOR", tp: mysql.TypeLong, size: 10, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "CHARACTER_SET_CLIENT", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
+	{name: "COLLATION_CONNECTION", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
+	{name: "DATABASE_COLLATION", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
 }
 
 var tableGlobalStatusCols = []columnInfo{
-	{"VARIABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"VARIABLE_VALUE", mysql.TypeVarchar, 1024, 0, nil, nil},
+	{name: "VARIABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "VARIABLE_VALUE", tp: mysql.TypeVarchar, size: 1024},
 }
 
 var tableGlobalVariablesCols = []columnInfo{
-	{"VARIABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"VARIABLE_VALUE", mysql.TypeVarchar, 1024, 0, nil, nil},
+	{name: "VARIABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "VARIABLE_VALUE", tp: mysql.TypeVarchar, size: 1024},
 }
 
 var tableSessionStatusCols = []columnInfo{
-	{"VARIABLE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, nil, nil},
-	{"VARIABLE_VALUE", mysql.TypeVarchar, 1024, 0, nil, nil},
+	{name: "VARIABLE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag},
+	{name: "VARIABLE_VALUE", tp: mysql.TypeVarchar, size: 1024},
 }
 
 var tableOptimizerTraceCols = []columnInfo{
-	{"QUERY", mysql.TypeLongBlob, 0, mysql.NotNullFlag, "", nil},
-	{"TRACE", mysql.TypeLongBlob, 0, mysql.NotNullFlag, "", nil},
-	{"MISSING_BYTES_BEYOND_MAX_MEM_SIZE", mysql.TypeShort, 20, mysql.NotNullFlag, 0, nil},
-	{"INSUFFICIENT_PRIVILEGES", mysql.TypeTiny, 1, mysql.NotNullFlag, 0, nil},
+	{name: "QUERY", tp: mysql.TypeLongBlob, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "TRACE", tp: mysql.TypeLongBlob, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "MISSING_BYTES_BEYOND_MAX_MEM_SIZE", tp: mysql.TypeShort, size: 20, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "INSUFFICIENT_PRIVILEGES", tp: mysql.TypeTiny, size: 1, flag: mysql.NotNullFlag, deflt: 0},
 }
 
 var tableTableSpacesCols = []columnInfo{
-	{"TABLESPACE_NAME", mysql.TypeVarchar, 64, mysql.NotNullFlag, "", nil},
-	{"ENGINE", mysql.TypeVarchar, 64, mysql.NotNullFlag, "", nil},
-	{"TABLESPACE_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LOGFILE_GROUP_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"EXTENT_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"AUTOEXTEND_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"MAXIMUM_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"NODEGROUP_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"TABLESPACE_COMMENT", mysql.TypeVarchar, 2048, 0, nil, nil},
+	{name: "TABLESPACE_NAME", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "ENGINE", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "TABLESPACE_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "LOGFILE_GROUP_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "EXTENT_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "AUTOEXTEND_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "MAXIMUM_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "NODEGROUP_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "TABLESPACE_COMMENT", tp: mysql.TypeVarchar, size: 2048},
 }
 
 var tableCollationCharacterSetApplicabilityCols = []columnInfo{
-	{"COLLATION_NAME", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
-	{"CHARACTER_SET_NAME", mysql.TypeVarchar, 32, mysql.NotNullFlag, nil, nil},
+	{name: "COLLATION_NAME", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
+	{name: "CHARACTER_SET_NAME", tp: mysql.TypeVarchar, size: 32, flag: mysql.NotNullFlag},
 }
 
 var tableProcesslistCols = []columnInfo{
-	{"ID", mysql.TypeLonglong, 21, mysql.NotNullFlag, 0, nil},
-	{"USER", mysql.TypeVarchar, 16, mysql.NotNullFlag, "", nil},
-	{"HOST", mysql.TypeVarchar, 64, mysql.NotNullFlag, "", nil},
-	{"DB", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"COMMAND", mysql.TypeVarchar, 16, mysql.NotNullFlag, "", nil},
-	{"TIME", mysql.TypeLong, 7, mysql.NotNullFlag, 0, nil},
-	{"STATE", mysql.TypeVarchar, 7, 0, nil, nil},
-	{"INFO", mysql.TypeString, 512, 0, nil, nil},
-	{"MEM", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"TxnStart", mysql.TypeVarchar, 64, mysql.NotNullFlag, "", nil},
+	{name: "ID", tp: mysql.TypeLonglong, size: 21, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "USER", tp: mysql.TypeVarchar, size: 16, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "HOST", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "DB", tp: mysql.TypeVarchar, size: 64},
+	{name: "COMMAND", tp: mysql.TypeVarchar, size: 16, flag: mysql.NotNullFlag, deflt: ""},
+	{name: "TIME", tp: mysql.TypeLong, size: 7, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "STATE", tp: mysql.TypeVarchar, size: 7},
+	{name: "INFO", tp: mysql.TypeString, size: 512},
+	{name: "MEM", tp: mysql.TypeLonglong, size: 21},
+	{name: "TxnStart", tp: mysql.TypeVarchar, size: 64, flag: mysql.NotNullFlag, deflt: ""},
 }
 
 var tableTiDBIndexesCols = []columnInfo{
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"NON_UNIQUE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"KEY_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SEQ_IN_INDEX", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"COLUMN_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SUB_PART", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"INDEX_COMMENT", mysql.TypeVarchar, 2048, 0, nil, nil},
-	{"Expression", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INDEX_ID", mysql.TypeLonglong, 21, 0, nil, nil},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "NON_UNIQUE", tp: mysql.TypeLonglong, size: 21},
+	{name: "KEY_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "SEQ_IN_INDEX", tp: mysql.TypeLonglong, size: 21},
+	{name: "COLUMN_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "SUB_PART", tp: mysql.TypeLonglong, size: 21},
+	{name: "INDEX_COMMENT", tp: mysql.TypeVarchar, size: 2048},
+	{name: "Expression", tp: mysql.TypeVarchar, size: 64},
+	{name: "INDEX_ID", tp: mysql.TypeLonglong, size: 21},
 }
 
 var slowQueryCols = []columnInfo{
-	{variable.SlowLogTimeStr, mysql.TypeTimestamp, 26, 0, nil, nil},
-	{variable.SlowLogTxnStartTSStr, mysql.TypeLonglong, 20, mysql.UnsignedFlag, nil, nil},
-	{variable.SlowLogUserStr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{variable.SlowLogHostStr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{variable.SlowLogConnIDStr, mysql.TypeLonglong, 20, mysql.UnsignedFlag, nil, nil},
-	{variable.SlowLogQueryTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogParseTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCompileTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.PreWriteTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.BinlogPrewriteTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.CommitTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.GetCommitTSTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.CommitBackoffTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.BackoffTypesStr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{execdetails.ResolveLockTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.LocalLatchWaitTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.WriteKeysStr, mysql.TypeLonglong, 22, 0, nil, nil},
-	{execdetails.WriteSizeStr, mysql.TypeLonglong, 22, 0, nil, nil},
-	{execdetails.PrewriteRegionStr, mysql.TypeLonglong, 22, 0, nil, nil},
-	{execdetails.TxnRetryStr, mysql.TypeLonglong, 22, 0, nil, nil},
-	{execdetails.ProcessTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.WaitTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.BackoffTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.LockKeysTimeStr, mysql.TypeDouble, 22, 0, nil, nil},
-	{execdetails.RequestCountStr, mysql.TypeLonglong, 20, mysql.UnsignedFlag, nil, nil},
-	{execdetails.TotalKeysStr, mysql.TypeLonglong, 20, mysql.UnsignedFlag, nil, nil},
-	{execdetails.ProcessKeysStr, mysql.TypeLonglong, 20, mysql.UnsignedFlag, nil, nil},
-	{variable.SlowLogDBStr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{variable.SlowLogIndexNamesStr, mysql.TypeVarchar, 100, 0, nil, nil},
-	{variable.SlowLogIsInternalStr, mysql.TypeTiny, 1, 0, nil, nil},
-	{variable.SlowLogDigestStr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{variable.SlowLogStatsInfoStr, mysql.TypeVarchar, 512, 0, nil, nil},
-	{variable.SlowLogCopProcAvg, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCopProcP90, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCopProcMax, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCopProcAddr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{variable.SlowLogCopWaitAvg, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCopWaitP90, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCopWaitMax, mysql.TypeDouble, 22, 0, nil, nil},
-	{variable.SlowLogCopWaitAddr, mysql.TypeVarchar, 64, 0, nil, nil},
-	{variable.SlowLogMemMax, mysql.TypeLonglong, 20, 0, nil, nil},
-	{variable.SlowLogSucc, mysql.TypeTiny, 1, 0, nil, nil},
-	{variable.SlowLogPlan, mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
-	{variable.SlowLogPlanDigest, mysql.TypeVarchar, 128, 0, nil, nil},
-	{variable.SlowLogPrevStmt, mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
-	{variable.SlowLogQuerySQLStr, mysql.TypeLongBlob, types.UnspecifiedLength, 0, nil, nil},
+	{name: variable.SlowLogTimeStr, tp: mysql.TypeTimestamp, size: 26},
+	{name: variable.SlowLogTxnStartTSStr, tp: mysql.TypeLonglong, size: 20, flag: mysql.UnsignedFlag},
+	{name: variable.SlowLogUserStr, tp: mysql.TypeVarchar, size: 64},
+	{name: variable.SlowLogHostStr, tp: mysql.TypeVarchar, size: 64},
+	{name: variable.SlowLogConnIDStr, tp: mysql.TypeLonglong, size: 20, flag: mysql.UnsignedFlag},
+	{name: variable.SlowLogQueryTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogParseTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCompileTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.PreWriteTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.BinlogPrewriteTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.CommitTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.GetCommitTSTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.CommitBackoffTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.BackoffTypesStr, tp: mysql.TypeVarchar, size: 64},
+	{name: execdetails.ResolveLockTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.LocalLatchWaitTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.WriteKeysStr, tp: mysql.TypeLonglong, size: 22},
+	{name: execdetails.WriteSizeStr, tp: mysql.TypeLonglong, size: 22},
+	{name: execdetails.PrewriteRegionStr, tp: mysql.TypeLonglong, size: 22},
+	{name: execdetails.TxnRetryStr, tp: mysql.TypeLonglong, size: 22},
+	{name: execdetails.ProcessTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.WaitTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.BackoffTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.LockKeysTimeStr, tp: mysql.TypeDouble, size: 22},
+	{name: execdetails.RequestCountStr, tp: mysql.TypeLonglong, size: 20, flag: mysql.UnsignedFlag},
+	{name: execdetails.TotalKeysStr, tp: mysql.TypeLonglong, size: 20, flag: mysql.UnsignedFlag},
+	{name: execdetails.ProcessKeysStr, tp: mysql.TypeLonglong, size: 20, flag: mysql.UnsignedFlag},
+	{name: variable.SlowLogDBStr, tp: mysql.TypeVarchar, size: 64},
+	{name: variable.SlowLogIndexNamesStr, tp: mysql.TypeVarchar, size: 100},
+	{name: variable.SlowLogIsInternalStr, tp: mysql.TypeTiny, size: 1},
+	{name: variable.SlowLogDigestStr, tp: mysql.TypeVarchar, size: 64},
+	{name: variable.SlowLogStatsInfoStr, tp: mysql.TypeVarchar, size: 512},
+	{name: variable.SlowLogCopProcAvg, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCopProcP90, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCopProcMax, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCopProcAddr, tp: mysql.TypeVarchar, size: 64},
+	{name: variable.SlowLogCopWaitAvg, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCopWaitP90, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCopWaitMax, tp: mysql.TypeDouble, size: 22},
+	{name: variable.SlowLogCopWaitAddr, tp: mysql.TypeVarchar, size: 64},
+	{name: variable.SlowLogMemMax, tp: mysql.TypeLonglong, size: 20},
+	{name: variable.SlowLogSucc, tp: mysql.TypeTiny, size: 1},
+	{name: variable.SlowLogPlan, tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
+	{name: variable.SlowLogPlanDigest, tp: mysql.TypeVarchar, size: 128},
+	{name: variable.SlowLogPrevStmt, tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
+	{name: variable.SlowLogQuerySQLStr, tp: mysql.TypeLongBlob, size: types.UnspecifiedLength},
 }
 
 var tableTiDBHotRegionsCols = []columnInfo{
-	{"TABLE_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"INDEX_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DB_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INDEX_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"REGION_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"MAX_HOT_DEGREE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"REGION_COUNT", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"FLOW_BYTES", mysql.TypeLonglong, 21, 0, nil, nil},
+	{name: "TABLE_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "INDEX_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "DB_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "INDEX_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "REGION_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "MAX_HOT_DEGREE", tp: mysql.TypeLonglong, size: 21},
+	{name: "REGION_COUNT", tp: mysql.TypeLonglong, size: 21},
+	{name: "FLOW_BYTES", tp: mysql.TypeLonglong, size: 21},
 }
 
 var tableTiKVStoreStatusCols = []columnInfo{
-	{"STORE_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"ADDRESS", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"STORE_STATE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"STORE_STATE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LABEL", mysql.TypeJSON, 51, 0, nil, nil},
-	{"VERSION", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"CAPACITY", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"AVAILABLE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LEADER_COUNT", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"LEADER_WEIGHT", mysql.TypeDouble, 22, 0, nil, nil},
-	{"LEADER_SCORE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"LEADER_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"REGION_COUNT", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"REGION_WEIGHT", mysql.TypeDouble, 22, 0, nil, nil},
-	{"REGION_SCORE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"REGION_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"START_TS", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"LAST_HEARTBEAT_TS", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"UPTIME", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "STORE_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "ADDRESS", tp: mysql.TypeVarchar, size: 64},
+	{name: "STORE_STATE", tp: mysql.TypeLonglong, size: 21},
+	{name: "STORE_STATE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "LABEL", tp: mysql.TypeJSON, size: 51},
+	{name: "VERSION", tp: mysql.TypeVarchar, size: 64},
+	{name: "CAPACITY", tp: mysql.TypeVarchar, size: 64},
+	{name: "AVAILABLE", tp: mysql.TypeVarchar, size: 64},
+	{name: "LEADER_COUNT", tp: mysql.TypeLonglong, size: 21},
+	{name: "LEADER_WEIGHT", tp: mysql.TypeDouble, size: 22},
+	{name: "LEADER_SCORE", tp: mysql.TypeDouble, size: 22},
+	{name: "LEADER_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "REGION_COUNT", tp: mysql.TypeLonglong, size: 21},
+	{name: "REGION_WEIGHT", tp: mysql.TypeDouble, size: 22},
+	{name: "REGION_SCORE", tp: mysql.TypeDouble, size: 22},
+	{name: "REGION_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "START_TS", tp: mysql.TypeDatetime},
+	{name: "LAST_HEARTBEAT_TS", tp: mysql.TypeDatetime},
+	{name: "UPTIME", tp: mysql.TypeVarchar, size: 64},
 }
 
 var tableAnalyzeStatusCols = []columnInfo{
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PARTITION_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"JOB_INFO", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PROCESSED_ROWS", mysql.TypeLonglong, 20, mysql.UnsignedFlag, nil, nil},
-	{"START_TIME", mysql.TypeDatetime, 0, 0, nil, nil},
-	{"STATE", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "PARTITION_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "JOB_INFO", tp: mysql.TypeVarchar, size: 64},
+	{name: "PROCESSED_ROWS", tp: mysql.TypeLonglong, size: 20, flag: mysql.UnsignedFlag},
+	{name: "START_TIME", tp: mysql.TypeDatetime},
+	{name: "STATE", tp: mysql.TypeVarchar, size: 64},
 }
 
 var tableTiKVRegionStatusCols = []columnInfo{
-	{"REGION_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"START_KEY", mysql.TypeBlob, types.UnspecifiedLength, 0, nil, nil},
-	{"END_KEY", mysql.TypeBlob, types.UnspecifiedLength, 0, nil, nil},
-	{"TABLE_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DB_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"IS_INDEX", mysql.TypeTiny, 1, mysql.NotNullFlag, 0, nil},
-	{"INDEX_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"INDEX_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"EPOCH_CONF_VER", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"EPOCH_VERSION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"WRITTEN_BYTES", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"READ_BYTES", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"APPROXIMATE_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"APPROXIMATE_KEYS", mysql.TypeLonglong, 21, 0, nil, nil},
+	{name: "REGION_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "START_KEY", tp: mysql.TypeBlob, size: types.UnspecifiedLength},
+	{name: "END_KEY", tp: mysql.TypeBlob, size: types.UnspecifiedLength},
+	{name: "TABLE_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "DB_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "IS_INDEX", tp: mysql.TypeTiny, size: 1, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "INDEX_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "INDEX_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "EPOCH_CONF_VER", tp: mysql.TypeLonglong, size: 21},
+	{name: "EPOCH_VERSION", tp: mysql.TypeLonglong, size: 21},
+	{name: "WRITTEN_BYTES", tp: mysql.TypeLonglong, size: 21},
+	{name: "READ_BYTES", tp: mysql.TypeLonglong, size: 21},
+	{name: "APPROXIMATE_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "APPROXIMATE_KEYS", tp: mysql.TypeLonglong, size: 21},
 }
 
 var tableTiKVRegionPeersCols = []columnInfo{
-	{"REGION_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"PEER_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"STORE_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"IS_LEARNER", mysql.TypeTiny, 1, mysql.NotNullFlag, 0, nil},
-	{"IS_LEADER", mysql.TypeTiny, 1, mysql.NotNullFlag, 0, nil},
-	{"STATUS", mysql.TypeVarchar, 10, 0, 0, nil},
-	{"DOWN_SECONDS", mysql.TypeLonglong, 21, 0, 0, nil},
+	{name: "REGION_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "PEER_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "STORE_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "IS_LEARNER", tp: mysql.TypeTiny, size: 1, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "IS_LEADER", tp: mysql.TypeTiny, size: 1, flag: mysql.NotNullFlag, deflt: 0},
+	{name: "STATUS", tp: mysql.TypeVarchar, size: 10, deflt: 0},
+	{name: "DOWN_SECONDS", tp: mysql.TypeLonglong, size: 21, deflt: 0},
 }
 
 var tableTiDBServersInfoCols = []columnInfo{
-	{"DDL_ID", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"IP", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PORT", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"STATUS_PORT", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"LEASE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"VERSION", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"GIT_HASH", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"BINLOG_STATUS", mysql.TypeVarchar, 64, 0, nil, nil},
+	{name: "DDL_ID", tp: mysql.TypeVarchar, size: 64},
+	{name: "IP", tp: mysql.TypeVarchar, size: 64},
+	{name: "PORT", tp: mysql.TypeLonglong, size: 21},
+	{name: "STATUS_PORT", tp: mysql.TypeLonglong, size: 21},
+	{name: "LEASE", tp: mysql.TypeVarchar, size: 64},
+	{name: "VERSION", tp: mysql.TypeVarchar, size: 64},
+	{name: "GIT_HASH", tp: mysql.TypeVarchar, size: 64},
+	{name: "BINLOG_STATUS", tp: mysql.TypeVarchar, size: 64},
 }
 
 var tableClusterConfigCols = []columnInfo{
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"KEY", mysql.TypeVarchar, 256, 0, nil, nil},
-	{"VALUE", mysql.TypeVarchar, 128, 0, nil, nil},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "KEY", tp: mysql.TypeVarchar, size: 256},
+	{name: "VALUE", tp: mysql.TypeVarchar, size: 128},
 }
 
 var tableClusterLogCols = []columnInfo{
-	{"TIME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LEVEL", mysql.TypeVarchar, 8, 0, nil, nil},
-	{"MESSAGE", mysql.TypeVarString, 1024, 0, nil, nil},
+	{name: "TIME", tp: mysql.TypeVarchar, size: 32},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "LEVEL", tp: mysql.TypeVarchar, size: 8},
+	{name: "MESSAGE", tp: mysql.TypeVarString, size: 1024},
 }
 
 var tableClusterLoadCols = []columnInfo{
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DEVICE_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DEVICE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"NAME", mysql.TypeVarchar, 256, 0, nil, nil},
-	{"VALUE", mysql.TypeVarchar, 128, 0, nil, nil},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "DEVICE_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "DEVICE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "NAME", tp: mysql.TypeVarchar, size: 256},
+	{name: "VALUE", tp: mysql.TypeVarchar, size: 128},
 }
 
 var tableClusterHardwareCols = []columnInfo{
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DEVICE_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DEVICE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"NAME", mysql.TypeVarchar, 256, 0, nil, nil},
-	{"VALUE", mysql.TypeVarchar, 128, 0, nil, nil},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "DEVICE_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "DEVICE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "NAME", tp: mysql.TypeVarchar, size: 256},
+	{name: "VALUE", tp: mysql.TypeVarchar, size: 128},
 }
 
 var tableClusterSystemInfoCols = []columnInfo{
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SYSTEM_TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SYSTEM_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"NAME", mysql.TypeVarchar, 256, 0, nil, nil},
-	{"VALUE", mysql.TypeVarchar, 128, 0, nil, nil},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "SYSTEM_TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "SYSTEM_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "NAME", tp: mysql.TypeVarchar, size: 256},
+	{name: "VALUE", tp: mysql.TypeVarchar, size: 128},
+}
+
+var filesCols = []columnInfo{
+	{name: "FILE_ID", tp: mysql.TypeLonglong, size: 4},
+	{name: "FILE_NAME", tp: mysql.TypeVarchar, size: 4000},
+	{name: "FILE_TYPE", tp: mysql.TypeVarchar, size: 20},
+	{name: "TABLESPACE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_CATALOG", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "LOGFILE_GROUP_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "LOGFILE_GROUP_NUMBER", tp: mysql.TypeLonglong, size: 32},
+	{name: "ENGINE", tp: mysql.TypeVarchar, size: 64},
+	{name: "FULLTEXT_KEYS", tp: mysql.TypeVarchar, size: 64},
+	{name: "DELETED_ROWS", tp: mysql.TypeLonglong, size: 4},
+	{name: "UPDATE_COUNT", tp: mysql.TypeLonglong, size: 4},
+	{name: "FREE_EXTENTS", tp: mysql.TypeLonglong, size: 4},
+	{name: "TOTAL_EXTENTS", tp: mysql.TypeLonglong, size: 4},
+	{name: "EXTENT_SIZE", tp: mysql.TypeLonglong, size: 4},
+	{name: "INITIAL_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "MAXIMUM_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "AUTOEXTEND_SIZE", tp: mysql.TypeLonglong, size: 21},
+	{name: "CREATION_TIME", tp: mysql.TypeDatetime, size: -1},
+	{name: "LAST_UPDATE_TIME", tp: mysql.TypeDatetime, size: -1},
+	{name: "LAST_ACCESS_TIME", tp: mysql.TypeDatetime, size: -1},
+	{name: "RECOVER_TIME", tp: mysql.TypeLonglong, size: 4},
+	{name: "TRANSACTION_COUNTER", tp: mysql.TypeLonglong, size: 4},
+	{name: "VERSION", tp: mysql.TypeLonglong, size: 21},
+	{name: "ROW_FORMAT", tp: mysql.TypeVarchar, size: 10},
+	{name: "TABLE_ROWS", tp: mysql.TypeLonglong, size: 21},
+	{name: "AVG_ROW_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATA_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "MAX_DATA_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "INDEX_LENGTH", tp: mysql.TypeLonglong, size: 21},
+	{name: "DATA_FREE", tp: mysql.TypeLonglong, size: 21},
+	{name: "CREATE_TIME", tp: mysql.TypeDatetime, size: -1},
+	{name: "UPDATE_TIME", tp: mysql.TypeDatetime, size: -1},
+	{name: "CHECK_TIME", tp: mysql.TypeDatetime, size: -1},
+	{name: "CHECKSUM", tp: mysql.TypeLonglong, size: 21},
+	{name: "STATUS", tp: mysql.TypeVarchar, size: 20},
+	{name: "EXTRA", tp: mysql.TypeVarchar, size: 255},
+}
+
+var tableClusterInfoCols = []columnInfo{
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "STATUS_ADDRESS", tp: mysql.TypeVarchar, size: 64},
+	{name: "VERSION", tp: mysql.TypeVarchar, size: 64},
+	{name: "GIT_HASH", tp: mysql.TypeVarchar, size: 64},
+	{name: "START_TIME", tp: mysql.TypeVarchar, size: 32},
+	{name: "UPTIME", tp: mysql.TypeVarchar, size: 32},
+}
+
+var tableTableTiFlashReplicaCols = []columnInfo{
+	{name: "TABLE_SCHEMA", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "TABLE_ID", tp: mysql.TypeLonglong, size: 21},
+	{name: "REPLICA_COUNT", tp: mysql.TypeLonglong, size: 64},
+	{name: "LOCATION_LABELS", tp: mysql.TypeVarchar, size: 64},
+	{name: "AVAILABLE", tp: mysql.TypeTiny, size: 1},
+	{name: "PROGRESS", tp: mysql.TypeDouble, size: 22},
+}
+
+var tableInspectionResultCols = []columnInfo{
+	{name: "RULE", tp: mysql.TypeVarchar, size: 64},
+	{name: "ITEM", tp: mysql.TypeVarchar, size: 64},
+	{name: "TYPE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "VALUE", tp: mysql.TypeVarchar, size: 64},
+	{name: "REFERENCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "SEVERITY", tp: mysql.TypeVarchar, size: 64},
+	{name: "DETAILS", tp: mysql.TypeVarchar, size: 256},
+}
+
+var tableInspectionSummaryCols = []columnInfo{
+	{name: "RULE", tp: mysql.TypeVarchar, size: 64},
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "METRICS_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "LABEL", tp: mysql.TypeVarchar, size: 64},
+	{name: "QUANTILE", tp: mysql.TypeDouble, size: 22},
+	{name: "AVG_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "MIN_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "MAX_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+}
+
+var tableMetricTablesCols = []columnInfo{
+	{name: "TABLE_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "PROMQL", tp: mysql.TypeVarchar, size: 64},
+	{name: "LABELS", tp: mysql.TypeVarchar, size: 64},
+	{name: "QUANTILE", tp: mysql.TypeDouble, size: 22},
+	{name: "COMMENT", tp: mysql.TypeVarchar, size: 256},
+}
+
+var tableMetricSummaryCols = []columnInfo{
+	{name: "METRICS_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "QUANTILE", tp: mysql.TypeDouble, size: 22},
+	{name: "SUM_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "AVG_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "MIN_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "MAX_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "COMMENT", tp: mysql.TypeVarchar, size: 256},
+}
+
+var tableMetricSummaryByLabelCols = []columnInfo{
+	{name: "INSTANCE", tp: mysql.TypeVarchar, size: 64},
+	{name: "METRICS_NAME", tp: mysql.TypeVarchar, size: 64},
+	{name: "LABEL", tp: mysql.TypeVarchar, size: 64},
+	{name: "QUANTILE", tp: mysql.TypeDouble, size: 22},
+	{name: "SUM_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "AVG_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "MIN_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "MAX_VALUE", tp: mysql.TypeDouble, size: 22, decimal: 6},
+	{name: "COMMENT", tp: mysql.TypeVarchar, size: 256},
 }
 
 func dataForTiKVRegionStatus(ctx sessionctx.Context) (records [][]types.Datum, err error) {
@@ -1125,119 +1239,6 @@ func dataForEngines() (records [][]types.Datum) {
 	return records
 }
 
-var filesCols = []columnInfo{
-	{"FILE_ID", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"FILE_NAME", mysql.TypeVarchar, 4000, 0, nil, nil},
-	{"FILE_TYPE", mysql.TypeVarchar, 20, 0, nil, nil},
-	{"TABLESPACE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_CATALOG", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LOGFILE_GROUP_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LOGFILE_GROUP_NUMBER", mysql.TypeLonglong, 32, 0, nil, nil},
-	{"ENGINE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"FULLTEXT_KEYS", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DELETED_ROWS", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"UPDATE_COUNT", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"FREE_EXTENTS", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"TOTAL_EXTENTS", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"EXTENT_SIZE", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"INITIAL_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"MAXIMUM_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"AUTOEXTEND_SIZE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CREATION_TIME", mysql.TypeDatetime, -1, 0, nil, nil},
-	{"LAST_UPDATE_TIME", mysql.TypeDatetime, -1, 0, nil, nil},
-	{"LAST_ACCESS_TIME", mysql.TypeDatetime, -1, 0, nil, nil},
-	{"RECOVER_TIME", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"TRANSACTION_COUNTER", mysql.TypeLonglong, 4, 0, nil, nil},
-	{"VERSION", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"ROW_FORMAT", mysql.TypeVarchar, 10, 0, nil, nil},
-	{"TABLE_ROWS", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"AVG_ROW_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATA_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"MAX_DATA_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"INDEX_LENGTH", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"DATA_FREE", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"CREATE_TIME", mysql.TypeDatetime, -1, 0, nil, nil},
-	{"UPDATE_TIME", mysql.TypeDatetime, -1, 0, nil, nil},
-	{"CHECK_TIME", mysql.TypeDatetime, -1, 0, nil, nil},
-	{"CHECKSUM", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"STATUS", mysql.TypeVarchar, 20, 0, nil, nil},
-	{"EXTRA", mysql.TypeVarchar, 255, 0, nil, nil},
-}
-
-var tableClusterInfoCols = []columnInfo{
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"STATUS_ADDRESS", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"VERSION", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"GIT_HASH", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"START_TIME", mysql.TypeVarchar, 32, 0, nil, nil},
-	{"UPTIME", mysql.TypeVarchar, 32, 0, nil, nil},
-}
-
-var tableTableTiFlashReplicaCols = []columnInfo{
-	{"TABLE_SCHEMA", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TABLE_ID", mysql.TypeLonglong, 21, 0, nil, nil},
-	{"REPLICA_COUNT", mysql.TypeLonglong, 64, 0, nil, nil},
-	{"LOCATION_LABELS", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"AVAILABLE", mysql.TypeTiny, 1, 0, nil, nil},
-	{"PROGRESS", mysql.TypeDouble, 22, 0, nil, nil},
-}
-
-var tableInspectionResultCols = []columnInfo{
-	{"RULE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"ITEM", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"TYPE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"VALUE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"REFERENCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"SEVERITY", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"DETAILS", mysql.TypeVarchar, 256, 0, nil, nil},
-}
-
-var tableInspectionSummaryCols = []columnInfo{
-	{"RULE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"METRICS_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LABEL", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"QUANTILE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"AVG_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"MIN_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"MAX_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-}
-
-var tableMetricTablesCols = []columnInfo{
-	{"TABLE_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"PROMQL", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LABELS", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"QUANTILE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"COMMENT", mysql.TypeVarchar, 256, 0, nil, nil},
-}
-
-var tableMetricSummaryCols = []columnInfo{
-	{"METRICS_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"QUANTILE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"SUM_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"AVG_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"MIN_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"MAX_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"COMMENT", mysql.TypeVarchar, 256, 0, nil, nil},
-}
-
-var tableMetricSummaryByLabelCols = []columnInfo{
-	{"INSTANCE", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"METRICS_NAME", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"LABEL", mysql.TypeVarchar, 64, 0, nil, nil},
-	{"QUANTILE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"SUM_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"AVG_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"MIN_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"MAX_VALUE", mysql.TypeDouble, 22, 0, nil, nil},
-	{"COMMENT", mysql.TypeVarchar, 256, 0, nil, nil},
-}
-
 func getRowCountAllTable(ctx sessionctx.Context) (map[int64]uint64, error) {
 	rows, _, err := ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL("select table_id, count from mysql.stats_meta")
 	if err != nil {