*: add split index region syntax (#10203)

executor/builder.go

@@ -168,6 +168,8 @@ func (b *executorBuilder) build(p plannercore.Plan) Executor {
 		return b.buildIndexReader(v)
 	case *plannercore.PhysicalIndexLookUpReader:
 		return b.buildIndexLookUpReader(v)
+	case *plannercore.SplitIndexRegion:
+		return b.buildSplitIndexRegion(v)
 	default:
 		b.err = ErrUnknownPlan.GenWithStack("Unknown Plan %T", p)
 		return nil
@@ -1322,6 +1324,17 @@ func (b *executorBuilder) buildUnionAll(v *plannercore.PhysicalUnionAll) Executo
 	return e
 }
 
+func (b *executorBuilder) buildSplitIndexRegion(v *plannercore.SplitIndexRegion) Executor {
+	base := newBaseExecutor(b.ctx, nil, v.ExplainID())
+	base.initCap = chunk.ZeroCapacity
+	return &SplitIndexRegionExec{
+		baseExecutor: base,
+		table:        v.Table,
+		indexInfo:    v.IndexInfo,
+		valueLists:   v.ValueLists,
+	}
+}
+
 func (b *executorBuilder) buildUpdate(v *plannercore.Update) Executor {
 	tblID2table := make(map[int64]table.Table)
 	for id := range v.SelectPlan.Schema().TblID2Handle {

executor/executor.go

@@ -1333,6 +1333,10 @@ func ResetContextOfStmt(ctx sessionctx.Context, s ast.StmtNode) (err error) {
 			sc.InShowWarning = true
 			sc.SetWarnings(vars.StmtCtx.GetWarnings())
 		}
+	case *ast.SplitIndexRegionStmt:
+		sc.IgnoreTruncate = false
+		sc.IgnoreZeroInDate = true
+		sc.AllowInvalidDate = vars.SQLMode.HasAllowInvalidDatesMode()
 	default:
 		sc.IgnoreTruncate = true
 		sc.IgnoreZeroInDate = true

executor/executor_test.go

@@ -3518,6 +3518,18 @@ func (s *testSuite) TestUnsignedFeedback(c *C) {
 	c.Assert(result.Rows()[2][3], Equals, "table:t, range:[0,+inf], keep order:false")
 }
 
+func (s *testSuite) TestSplitIndexRegion(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a varchar(100),b int, index idx1(b,a))")
+	tk.MustExec(`split table t index idx1 by (10000,"abcd"),(10000000);`)
+	_, err := tk.Exec(`split table t index idx1 by ("abcd");`)
+	c.Assert(err, NotNil)
+	terr := errors.Cause(err).(*terror.Error)
+	c.Assert(terr.Code(), Equals, terror.ErrCode(mysql.WarnDataTruncated))
+}
+
 type testOOMSuite struct {
 	store kv.Storage
 	do    *domain.Domain

executor/split.go

@@ -0,0 +1,84 @@
+// Copyright 2019 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package executor
+
+import (
+	"context"
+	"math"
+
+	"github.com/pingcap/parser/model"
+	"github.com/pingcap/tidb/kv"
+	"github.com/pingcap/tidb/table"
+	"github.com/pingcap/tidb/table/tables"
+	"github.com/pingcap/tidb/types"
+	"github.com/pingcap/tidb/util/chunk"
+	"github.com/pingcap/tidb/util/logutil"
+	"go.uber.org/zap"
+)
+
+// SplitIndexRegionExec represents a split index regions executor.
+type SplitIndexRegionExec struct {
+	baseExecutor
+
+	table      table.Table
+	indexInfo  *model.IndexInfo
+	valueLists [][]types.Datum
+}
+
+type splitableStore interface {
+	SplitRegionAndScatter(splitKey kv.Key) (uint64, error)
+	WaitScatterRegionFinish(regionID uint64) error
+}
+
+// Next implements the Executor Next interface.
+func (e *SplitIndexRegionExec) Next(ctx context.Context, _ *chunk.Chunk) error {
+	store := e.ctx.GetStore()
+	s, ok := store.(splitableStore)
+	if !ok {
+		return nil
+	}
+	regionIDs := make([]uint64, 0, len(e.valueLists))
+	index := tables.NewIndex(e.table.Meta().ID, e.table.Meta(), e.indexInfo)
+	for _, values := range e.valueLists {
+		idxKey, _, err := index.GenIndexKey(e.ctx.GetSessionVars().StmtCtx, values, math.MinInt64, nil)
+		if err != nil {
+			return err
+		}
+
+		regionID, err := s.SplitRegionAndScatter(idxKey)
+		if err != nil {
+			logutil.Logger(context.Background()).Warn("split table index region failed",
+				zap.String("table", e.table.Meta().Name.L),
+				zap.String("index", e.indexInfo.Name.L),
+				zap.Error(err))
+			continue
+		}
+		regionIDs = append(regionIDs, regionID)
+
+	}
+	if !e.ctx.GetSessionVars().WaitTableSplitFinish {
+		return nil
+	}
+	for _, regionID := range regionIDs {
+		err := s.WaitScatterRegionFinish(regionID)
+		if err != nil {
+			logutil.Logger(context.Background()).Warn("wait scatter region failed",
+				zap.Uint64("regionID", regionID),
+				zap.String("table", e.table.Meta().Name.L),
+				zap.String("index", e.indexInfo.Name.L),
+				zap.Error(err))
+		}
+	}
+	return nil
+}

go.mod

@@ -79,3 +79,5 @@ require (
 	gopkg.in/natefinch/lumberjack.v2 v2.0.0
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 )
+
+replace github.com/pingcap/parser => github.com/crazycs520/parser v0.0.0-20190619121853-a6bb78486e7f

go.sum

@@ -16,6 +16,10 @@ github.com/coreos/etcd v3.2.18+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20180202092358-40e2722dffea/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/crazycs520/parser v0.0.0-20190619121024-40e7ecaa504a h1:mij7LmNM+GCtIVFM/AZNwv4M2xCgm5w3WVVCLhMz3d8=
+github.com/crazycs520/parser v0.0.0-20190619121024-40e7ecaa504a/go.mod h1:xLjI+gnWYexq011WPMEvCNS8rFM9qe1vdojIEzSKPuc=
+github.com/crazycs520/parser v0.0.0-20190619121853-a6bb78486e7f h1:9oZ1G26gYo3ZvZBCeduAdHOIj1y1fm1dynqvEm+Iy10=
+github.com/crazycs520/parser v0.0.0-20190619121853-a6bb78486e7f/go.mod h1:xLjI+gnWYexq011WPMEvCNS8rFM9qe1vdojIEzSKPuc=
 github.com/cznic/mathutil v0.0.0-20160613104831-78ad7f262603 h1:hhR9hTi0ligs11JjfGDBP332clNOJRdW0Ci5oHtEC+0=
 github.com/cznic/mathutil v0.0.0-20160613104831-78ad7f262603/go.mod h1:e6NPNENfs9mPDVNRekM7lKScauxd5kXTr1Mfyig6TDM=
 github.com/cznic/sortutil v0.0.0-20150617083342-4c7342852e65 h1:hxuZop6tSoOi0sxFzoGGYdRqNrPubyaIf9KoBG9tPiE=

planner/core/common_plans.go

@@ -29,6 +29,7 @@ import (
 	"github.com/pingcap/tidb/metrics"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/table"
+	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/types/parser_driver"
 	"github.com/pingcap/tidb/util/chunk"
 	"github.com/pingcap/tidb/util/kvcache"
@@ -403,6 +404,15 @@ type LoadStats struct {
 	Path string
 }
 
+// SplitIndexRegion represents a split index regions plan.
+type SplitIndexRegion struct {
+	baseSchemaProducer
+
+	Table      table.Table
+	IndexInfo  *model.IndexInfo
+	ValueLists [][]types.Datum
+}
+
 // DDL represents a DDL statement plan.
 type DDL struct {
 	baseSchemaProducer

planner/core/planbuilder.go

@@ -224,6 +224,8 @@ func (b *planBuilder) build(node ast.Node) (Plan, error) {
 		return b.buildSimple(node.(ast.StmtNode)), nil
 	case ast.DDLNode:
 		return b.buildDDL(x)
+	case *ast.SplitIndexRegionStmt:
+		return b.buildSplitIndexRegion(x)
 	}
 	return nil, ErrUnsupportedType.GenWithStack("Unsupported type %T", node)
 }
@@ -1426,6 +1428,46 @@ func (b *planBuilder) buildLoadStats(ld *ast.LoadStatsStmt) Plan {
 	return p
 }
 
+func (b *planBuilder) buildSplitIndexRegion(node *ast.SplitIndexRegionStmt) (Plan, error) {
+	tblInfo := node.Table.TableInfo
+	indexInfo := tblInfo.FindIndexByName(strings.ToLower(node.IndexName))
+	if indexInfo == nil {
+		return nil, ErrKeyDoesNotExist.GenWithStackByArgs(node.IndexName, tblInfo.Name)
+	}
+
+	indexValues := make([][]types.Datum, 0, len(node.ValueLists))
+	for i, valuesItem := range node.ValueLists {
+		if len(valuesItem) > len(indexInfo.Columns) {
+			return nil, ErrWrongValueCountOnRow.GenWithStackByArgs(i + 1)
+		}
+		valueList := make([]types.Datum, 0, len(valuesItem))
+		for j, valueItem := range valuesItem {
+			x, ok := valueItem.(*driver.ValueExpr)
+			if !ok {
+				return nil, errors.New("expect constant values")
+			}
+			colOffset := indexInfo.Columns[j].Offset
+			value, err := x.Datum.ConvertTo(b.ctx.GetSessionVars().StmtCtx, &tblInfo.Columns[colOffset].FieldType)
+			if err != nil {
+				return nil, err
+			}
+
+			valueList = append(valueList, value)
+		}
+		indexValues = append(indexValues, valueList)
+	}
+	tableInPlan, ok := b.is.TableByID(tblInfo.ID)
+	if !ok {
+		return nil, errors.Errorf("Can't get table %s.", tblInfo.Name.O)
+	}
+	return &SplitIndexRegion{
+		Table:      tableInPlan,
+		IndexInfo:  indexInfo,
+		ValueLists: indexValues,
+	}, nil
+
+}
+
 func (b *planBuilder) buildDDL(node ast.DDLNode) (Plan, error) {
 	switch v := node.(type) {
 	case *ast.AlterDatabaseStmt: