ddl: fix bug that range columns partition table add partitions failed (…

…pingcap#12348)

ddl/db_partition_test.go

@@ -170,6 +170,19 @@ func (s *testIntegrationSuite9) TestCreateTableWithPartition(c *C) {
 	);`
 	assertErrorCode(c, tk, sql9, tmysql.ErrPartitionFunctionIsNotAllowed)
 
+	assertErrorCode(c, tk, `create TABLE t10 (c1 int,c2 int) partition by range(c1 / c2 ) (partition p0 values less than (2));`, tmysql.ErrPartitionFunctionIsNotAllowed)
+	_, err = tk.Exec(`CREATE TABLE t9 (
+		a INT NOT NULL,
+		b INT NOT NULL,
+		c INT NOT NULL
+	)
+	partition by range columns(a) (
+	partition p0 values less than (10),
+	partition p2 values less than (20),
+	partition p3 values less than (20)
+	);`)
+	c.Assert(ddl.ErrRangeNotIncreasing.Equal(err), IsTrue)
+
 	assertErrorCode(c, tk, `create TABLE t10 (c1 int,c2 int) partition by range(c1 / c2 ) (partition p0 values less than (2));`, tmysql.ErrPartitionFunctionIsNotAllowed)
 
 	tk.MustExec(`create TABLE t11 (c1 int,c2 int) partition by range(c1 div c2 ) (partition p0 values less than (2));`)
@@ -525,6 +538,13 @@ func (s *testIntegrationSuite5) TestAlterTableAddPartition(c *C) {
 	);`)
 	tk.MustExec(`ALTER TABLE tt5 add partition ( partition p2 values less than (-1) );`)
 	tk.MustExec(`ALTER TABLE tt5 add partition ( partition p3 values less than (5-1) );`)
+
+	// Test add partition for the table partition by range columns.
+	tk.MustExec("drop table if exists t;")
+	tk.MustExec("create table t (a datetime) partition by range columns (a) (partition p1 values less than ('2019-06-01'), partition p2 values less than ('2019-07-01'));")
+	sql := "alter table t add partition ( partition p3 values less than ('2019-07-01'));"
+	tk.MustGetErrCode(sql, tmysql.ErrRangeNotIncreasing)
+	tk.MustExec("alter table t add partition ( partition p3 values less than ('2019-08-01'));")
 }
 
 func (s *testIntegrationSuite6) TestAlterTableDropPartition(c *C) {

ddl/ddl_api.go

@@ -1324,11 +1324,7 @@ func buildTableInfoWithCheck(ctx sessionctx.Context, d *ddl, s *ast.CreateTableS
 	if pi != nil {
 		switch pi.Type {
 		case model.PartitionTypeRange:
-			if len(pi.Columns) == 0 {
-				err = checkPartitionByRange(ctx, tbInfo, pi, s, cols, newConstraints)
-			} else {
-				err = checkPartitionByRangeColumn(ctx, tbInfo, pi, s)
-			}
+			err = checkPartitionByRange(ctx, tbInfo, pi, cols, s)
 		case model.PartitionTypeHash:
 			err = checkPartitionByHash(ctx, pi, s, cols, tbInfo)
 		}
@@ -1572,12 +1568,8 @@ func checkPartitionByHash(ctx sessionctx.Context, pi *model.PartitionInfo, s *as
 	return checkPartitionFuncType(ctx, s, cols, tbInfo)
 }
 
-func checkPartitionByRange(ctx sessionctx.Context, tbInfo *model.TableInfo, pi *model.PartitionInfo, s *ast.CreateTableStmt, cols []*table.Column, newConstraints []*ast.Constraint) error {
-	if err := checkPartitionNameUnique(tbInfo, pi); err != nil {
-		return err
-	}
-
-	if err := checkCreatePartitionValue(ctx, tbInfo, pi, cols); err != nil {
+func checkPartitionByRange(ctx sessionctx.Context, tbInfo *model.TableInfo, pi *model.PartitionInfo, cols []*table.Column, s *ast.CreateTableStmt) error {
+	if err := checkPartitionNameUnique(pi); err != nil {
 		return err
 	}
 
@@ -1589,31 +1581,28 @@ func checkPartitionByRange(ctx sessionctx.Context, tbInfo *model.TableInfo, pi *
 		return err
 	}
 
-	if err := checkPartitionFuncValid(ctx, tbInfo, s.Partition.Expr); err != nil {
-		return err
-	}
+	if len(pi.Columns) == 0 {
+		if err := checkCreatePartitionValue(ctx, tbInfo, pi, cols); err != nil {
+			return err
+		}
 
-	return checkPartitionFuncType(ctx, s, cols, tbInfo)
-}
+		// s maybe nil when add partition.
+		if s == nil {
+			return nil
+		}
 
-func checkPartitionByRangeColumn(ctx sessionctx.Context, tbInfo *model.TableInfo, pi *model.PartitionInfo, s *ast.CreateTableStmt) error {
-	if err := checkPartitionNameUnique(tbInfo, pi); err != nil {
-		return err
+		if err := checkPartitionFuncValid(ctx, tbInfo, s.Partition.Expr); err != nil {
+			return err
+		}
+		return checkPartitionFuncType(ctx, s, cols, tbInfo)
 	}
 
+	// Check for range columns partition.
 	if err := checkRangeColumnsPartitionType(tbInfo, pi.Columns); err != nil {
 		return err
 	}
 
-	if err := checkRangeColumnsPartitionValue(ctx, tbInfo, pi); err != nil {
-		return err
-	}
-
-	if err := checkNoRangePartitions(len(pi.Definitions)); err != nil {
-		return errors.Trace(err)
-	}
-
-	return checkAddPartitionTooManyPartitions(uint64(len(pi.Definitions)))
+	return checkRangeColumnsPartitionValue(ctx, tbInfo, pi)
 }
 
 func checkRangeColumnsPartitionType(tbInfo *model.TableInfo, columns []model.CIStr) error {
@@ -1649,8 +1638,9 @@ func checkRangeColumnsPartitionValue(ctx sessionctx.Context, tbInfo *model.Table
 	if len(curr.LessThan) != len(pi.Columns) {
 		return errors.Trace(ast.ErrPartitionColumnList)
 	}
+	var prev *model.PartitionDefinition
 	for i := 1; i < len(defs); i++ {
-		prev, curr := curr, &defs[i]
+		prev, curr = curr, &defs[i]
 		succ, err := checkTwoRangeColumns(ctx, curr, prev, pi, tbInfo)
 		if err != nil {
 			return err
@@ -2198,7 +2188,7 @@ func (d *ddl) AddTablePartitions(ctx sessionctx.Context, ident ast.Ident, spec *
 		return errors.Trace(err)
 	}
 
-	err = checkPartitionNameUnique(meta, partInfo)
+	err = checkPartitionNameUnique(partInfo)
 	if err != nil {
 		return errors.Trace(err)
 	}
@@ -2207,7 +2197,7 @@ func (d *ddl) AddTablePartitions(ctx sessionctx.Context, ident ast.Ident, spec *
 	// old partitions to check all partitions is strictly increasing.
 	tmp := *partInfo
 	tmp.Definitions = append(pi.Definitions, tmp.Definitions...)
-	err = checkCreatePartitionValue(ctx, meta, &tmp, t.Cols())
+	err = checkPartitionByRange(ctx, meta, &tmp, t.Cols(), nil)
 	if err != nil {
 		return errors.Trace(err)
 	}

ddl/partition.go

@@ -161,7 +161,19 @@ func buildRangePartitionDefinitions(ctx sessionctx.Context, d *ddl, s *ast.Creat
 	return nil
 }
 
-func checkPartitionNameUnique(tbInfo *model.TableInfo, pi *model.PartitionInfo) error {
+func checkPartitionNameUnique(pi *model.PartitionInfo) error {
+	partNames := make(map[string]struct{})
+	newPars := pi.Definitions
+	for _, newPar := range newPars {
+		if _, ok := partNames[newPar.Name.L]; ok {
+			return ErrSameNamePartition.GenWithStackByArgs(newPar.Name)
+		}
+		partNames[newPar.Name.L] = struct{}{}
+	}
+	return nil
+}
+
+func checkAddPartitionNameUnique(tbInfo *model.TableInfo, pi *model.PartitionInfo) error {
 	partNames := make(map[string]struct{})
 	if tbInfo.Partition != nil {
 		oldPars := tbInfo.Partition.Definitions

ddl/table.go

@@ -772,7 +772,7 @@ func onAddTablePartition(t *meta.Meta, job *model.Job) (ver int64, _ error) {
 		return ver, errors.Trace(err)
 	}
 
-	err = checkPartitionNameUnique(tblInfo, partInfo)
+	err = checkAddPartitionNameUnique(tblInfo, partInfo)
 	if err != nil {
 		job.State = model.JobStateCancelled
 		return ver, errors.Trace(err)