fix: should sort the columns, otherwise the primary key index obtaine…

…d is wrong (#131)

pkg/meta/table_meta_cache.go

@@ -150,7 +150,8 @@ func GetColumns(ctx context.Context, db proto.DB, tableName string) ([]schema.Co
 	//`EXTRA`,	`PRIVILEGES`, `COLUMN_COMMENT`, `GENERATION_EXPRESSION`, `SRS_ID`
 	s := "SELECT `TABLE_CATALOG`, `TABLE_SCHEMA`, `TABLE_NAME`, `COLUMN_NAME`, `DATA_TYPE`, `CHARACTER_MAXIMUM_LENGTH`, " +
 		"`NUMERIC_PRECISION`, `NUMERIC_SCALE`, `IS_NULLABLE`, `COLUMN_COMMENT`, `COLUMN_DEFAULT`, `CHARACTER_OCTET_LENGTH`, " +
-		"`ORDINAL_POSITION`, `COLUMN_KEY`, `EXTRA`  FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE `TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?"
+		"`ORDINAL_POSITION`, `COLUMN_KEY`, `EXTRA`  FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE `TABLE_SCHEMA` = ? " +
+		"AND `TABLE_NAME` = ? ORDER BY ORDINAL_POSITION ASC"
 
 	// should use new context, otherwise, some filters will be executed repeatedly.
 	dataTable, _, err := db.ExecuteSql(context.Background(), s, schemaName, tn)