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Support sort merge join #845

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Support sort merge join #845

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a9a5c67
Support sort merge join
csynineyang Jul 3, 2024
bbbb68b
Add valid license header
csynineyang Jul 3, 2024
5c2594a
Format source code style
csynineyang Jul 3, 2024
95fd098
fix code review
csynineyang Jul 18, 2024
904ce32
fix code review
csynineyang Jul 18, 2024
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68 changes: 29 additions & 39 deletions pkg/dataset/sort_merge_join.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
package dataset

import (
"bytes"
"io"
"sync"
)
Expand All @@ -31,6 +32,7 @@ import (
)

import (
"github.com/arana-db/arana/pkg/mysql"
"github.com/arana-db/arana/pkg/mysql/rows"
"github.com/arana-db/arana/pkg/proto"
"github.com/arana-db/arana/pkg/runtime/ast"
Expand Down Expand Up @@ -77,8 +79,8 @@ func NewSortMergeJoin(joinType ast.JoinType, joinColumn *JoinColumn, outer proto
}

fields := make([]proto.Field, 0, len(outerFields)+len(innerFields))
fields = append(fields, outerFields...)
fields = append(fields, innerFields...)
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fields = append(fields, outerFields...)

if joinType == ast.RightJoin {
outer, inner = inner, outer
Expand Down Expand Up @@ -249,6 +251,10 @@ func (j *JoinColumn) Column() string {
return ""
}

func (j *JoinColumn) SetColumn(column string) {
j.column = column
}

func (s *SortMergeJoin) Close() error {
return nil
}
Expand All @@ -263,16 +269,12 @@ func (s *SortMergeJoin) Next() (proto.Row, error) {
outerRow, innerRow proto.Row
)

if s.LastRow() != nil {
outerRow = s.LastRow()
} else {
outerRow, err = s.getOuterRow()
if err != nil {
return nil, err
}
outerRow, err = s.getOuterRow()
if err != nil {
return nil, err
}

innerRow, err = s.getInnerRow(outerRow)
innerRow, err = s.getInnerRow()
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -319,6 +321,7 @@ func (s *SortMergeJoin) innerJoin(outerRow proto.Row, innerRow proto.Row) (proto
if res, err := s.equalCompare(outerRow, innerRow, outerValue); err != nil {
return nil, err
} else {
s.SetLastInnerRow(innerRow)
return res, nil
}
}
Expand Down Expand Up @@ -469,12 +472,6 @@ func (s *SortMergeJoin) rightJoin(outerRow proto.Row, innerRow proto.Row) (proto
}

func (s *SortMergeJoin) getOuterRow() (proto.Row, error) {
nextOuterRow := s.NextOuterRow()
if nextOuterRow != nil {
s.ResetNextOuterRow()
return nextOuterRow, nil
}

leftRow, err := s.outer.Next()
if err != nil && errors.Is(err, io.EOF) {
return nil, nil
Expand All @@ -486,21 +483,7 @@ func (s *SortMergeJoin) getOuterRow() (proto.Row, error) {
return leftRow, nil
}

func (s *SortMergeJoin) getInnerRow(outerRow proto.Row) (proto.Row, error) {
if outerRow != nil {
outerValue, err := outerRow.(proto.KeyedRow).Get(s.joinColumn.Column())
if err != nil {
return nil, err
}

if s.DescartesFlag() {
innerRow := s.EqualValue(outerValue.String())
if innerRow != nil {
return innerRow, nil
}
}
}

func (s *SortMergeJoin) getInnerRow() (proto.Row, error) {
lastInnerRow := s.LastInnerRow()
if lastInnerRow != nil {
s.ResetLastInnerRow()
Expand All @@ -518,19 +501,22 @@ func (s *SortMergeJoin) getInnerRow(outerRow proto.Row) (proto.Row, error) {
return rightRow, nil
}

func (s *SortMergeJoin) resGenerate(leftRow proto.Row, rightRow proto.Row) proto.Row {
func (s *SortMergeJoin) resGenerate(rightRow proto.Row, leftRow proto.Row) proto.Row {
var (
leftValue []proto.Value
rightValue []proto.Value
res []proto.Value
realFields []proto.Field
)

if leftRow == nil && rightRow == nil {
return nil
}

leftFields, _ := s.outer.Fields()
rightFields, _ := s.inner.Fields()
leftFields, _ := s.inner.Fields()
realFields = append(realFields, leftFields[:(len(leftFields)-1)]...)
rightFields, _ := s.outer.Fields()
realFields = append(realFields, rightFields[:(len(rightFields)-1)]...)

leftValue = make([]proto.Value, len(leftFields))
rightValue = make([]proto.Value, len(rightFields))
Expand Down Expand Up @@ -560,12 +546,16 @@ func (s *SortMergeJoin) resGenerate(leftRow proto.Row, rightRow proto.Row) proto
}
}

res = append(res, leftValue...)
res = append(res, rightValue...)

fields, _ := s.Fields()
res = append(res, leftValue[:(len(leftValue)-1)]...)
res = append(res, rightValue[:(len(rightValue)-1)]...)

return rows.NewBinaryVirtualRow(fields, res)
var b bytes.Buffer
row := rows.NewTextVirtualRow(realFields, res)
_, err := row.WriteTo(&b)
if err != nil {
return nil
}
return mysql.NewTextRow(realFields, b.Bytes())
}

func (s *SortMergeJoin) equalCompare(outerRow proto.Row, innerRow proto.Row, outerValue proto.Value) (proto.Row, error) {
Expand Down Expand Up @@ -614,7 +604,7 @@ func (s *SortMergeJoin) greaterCompare(outerRow proto.Row) (proto.Row, proto.Row
innerRow = s.EqualValue(outerValue.String())
} else {
s.setDescartesFlag(NotDescartes)
innerRow, err = s.getInnerRow(outerRow)
innerRow, err = s.getInnerRow()
if err != nil {
return nil, nil, err
}
Expand Down
6 changes: 3 additions & 3 deletions pkg/proto/schema.go
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Original file line number Diff line number Diff line change
Expand Up @@ -48,8 +48,7 @@ func NewTableMetadata(name string, columnMetadataList []*ColumnMetadata, indexMe
}
}
for _, indexMetadata := range indexMetadataList {
indexName := strings.ToLower(indexMetadata.Name)
tma.Indexes[indexName] = indexMetadata
tma.Indexes[indexMetadata.ColumnName] = indexMetadata
}

return tma
Expand All @@ -66,7 +65,8 @@ type ColumnMetadata struct {
}

type IndexMetadata struct {
Name string
ColumnName string
Name string
}

var _defaultSchemaLoader SchemaLoader
Expand Down
69 changes: 51 additions & 18 deletions pkg/runtime/optimize/dml/select.go
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Original file line number Diff line number Diff line change
Expand Up @@ -464,12 +464,28 @@ func optimizeJoin(ctx context.Context, o *optimize.Optimizer, stmt *ast.SelectSt
if err != nil {
return nil, err
}
var tbLeft0 = tableLeft.Suffix()
if shardsLeft != nil {
_, tbLeft0 = shardsLeft.Smallest()
}
leftTblMeta, err := loadMetadataByTable(ctx, tbLeft0)
if err != nil {
return nil, err
}
Comment on lines +467 to +474
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Add error context for better debugging.

When loading metadata for the left table, add context to the error message for easier debugging.

-    return nil, err
+    return nil, errors.Wrapf(err, "failed to load metadata for left table: %s", tbLeft0)
Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
var tbLeft0 = tableLeft.Suffix()
if shardsLeft != nil {
_, tbLeft0 = shardsLeft.Smallest()
}
leftTblMeta, err := loadMetadataByTable(ctx, tbLeft0)
if err != nil {
return nil, err
}
var tbLeft0 = tableLeft.Suffix()
if shardsLeft != nil {
_, tbLeft0 = shardsLeft.Smallest()
}
leftTblMeta, err = loadMetadataByTable(ctx, tbLeft0)
if err != nil {
return nil, errors.Wrapf(err, "failed to load metadata for left table: %s", tbLeft0)
}


join := from.Joins[0]
dbRight, aliasRight, tableRight, shardsRight, err := compute(join.Target)
if err != nil {
return nil, err
}
var tbRight0 = tableRight.Suffix()
if shardsRight != nil {
_, tbRight0 = shardsRight.Smallest()
}
rightTblMeta, err := loadMetadataByTable(ctx, tbRight0)
if err != nil {
return nil, err
}
Comment on lines +481 to +488
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Add error context for better debugging.

When loading metadata for the right table, add context to the error message for easier debugging.

-    return nil, err
+    return nil, errors.Wrapf(err, "failed to load metadata for right table: %s", tbRight0)
Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
var tbRight0 = tableRight.Suffix()
if shardsRight != nil {
_, tbRight0 = shardsRight.Smallest()
}
rightTblMeta, err := loadMetadataByTable(ctx, tbRight0)
if err != nil {
return nil, err
}
var tbRight0 = tableRight.Suffix()
if shardsRight != nil {
_, tbRight0 = shardsRight.Smallest()
}
rightTblMeta, err := loadMetadataByTable(ctx, tbRight0)
if err != nil {
return nil, errors.Wrapf(err, "failed to load metadata for right table: %s", tbRight0)
}


// one db
if dbLeft == dbRight && shardsLeft == nil && shardsRight == nil {
Expand Down Expand Up @@ -517,6 +533,7 @@ func optimizeJoin(ctx context.Context, o *optimize.Optimizer, stmt *ast.SelectSt
return nil, errors.Errorf("not found buildKey or probeKey")
}

shouldSortMerge := shouldSortMergeJoin(leftTblMeta, rightTblMeta, leftKey, rightKey)
rewriteToSingle := func(tableSource ast.TableSourceItem, shards map[string][]string, onKey string) (proto.Plan, error) {
selectStmt := &ast.SelectStatement{
Select: stmt.Select,
Expand Down Expand Up @@ -594,30 +611,42 @@ func optimizeJoin(ctx context.Context, o *optimize.Optimizer, stmt *ast.SelectSt
return nil, err
}

setPlan := func(plan *dml.HashJoinPlan, buildPlan, probePlan proto.Plan, buildKey, probeKey string) {
plan.BuildKey = buildKey
plan.ProbeKey = probeKey
plan.BuildPlan = buildPlan
plan.ProbePlan = probePlan
}
var tmpPlan proto.Plan

if join.Typ == ast.InnerJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
hashJoinPlan.IsFilterProbeRow = true
if shouldSortMerge {
tmpPlan = &dml.SortMergeJoin{
Stmt: stmt,
LeftQuery: leftPlan,
RightQuery: rightPlan,
JoinType: join.Typ,
LeftKey: leftKey,
RightKey: rightKey,
}
} else {
hashJoinPlan.IsFilterProbeRow = false
if join.Typ == ast.LeftJoin {
hashJoinPlan.IsReversedColumn = true
setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
} else if join.Typ == ast.RightJoin {
setPlan := func(plan *dml.HashJoinPlan, buildPlan, probePlan proto.Plan, buildKey, probeKey string) {
plan.BuildKey = buildKey
plan.ProbeKey = probeKey
plan.BuildPlan = buildPlan
plan.ProbePlan = probePlan
}

if join.Typ == ast.InnerJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
hashJoinPlan.IsFilterProbeRow = true
} else {
return nil, errors.New("not support Join Type")
hashJoinPlan.IsFilterProbeRow = false
if join.Typ == ast.LeftJoin {
hashJoinPlan.IsReversedColumn = true
setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
} else if join.Typ == ast.RightJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
} else {
return nil, errors.New("not support Join Type")
}
Comment on lines +626 to +645
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Consider refactoring for readability.

The nested if-else structure for setting the hash join plan can be refactored for better readability.

-    if join.Typ == ast.InnerJoin {
-        setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
-        hashJoinPlan.IsFilterProbeRow = true
-    } else {
-        hashJoinPlan.IsFilterProbeRow = false
-        if join.Typ == ast.LeftJoin {
-            hashJoinPlan.IsReversedColumn = true
-            setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
-        } else if join.Typ == ast.RightJoin {
-            setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
-        } else {
-            return nil, errors.New("not support Join Type")
-        }
-    }
+    switch join.Typ {
+    case ast.InnerJoin:
+        setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
+        hashJoinPlan.IsFilterProbeRow = true
+    case ast.LeftJoin:
+        hashJoinPlan.IsReversedColumn = true
+        setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
+        hashJoinPlan.IsFilterProbeRow = false
+    case ast.RightJoin:
+        setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
+        hashJoinPlan.IsFilterProbeRow = false
+    default:
+        return nil, errors.New("not support Join Type")
+    }
Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
setPlan := func(plan *dml.HashJoinPlan, buildPlan, probePlan proto.Plan, buildKey, probeKey string) {
plan.BuildKey = buildKey
plan.ProbeKey = probeKey
plan.BuildPlan = buildPlan
plan.ProbePlan = probePlan
}
if join.Typ == ast.InnerJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
hashJoinPlan.IsFilterProbeRow = true
} else {
return nil, errors.New("not support Join Type")
hashJoinPlan.IsFilterProbeRow = false
if join.Typ == ast.LeftJoin {
hashJoinPlan.IsReversedColumn = true
setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
} else if join.Typ == ast.RightJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
} else {
return nil, errors.New("not support Join Type")
}
if join.Typ == ast.InnerJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
hashJoinPlan.IsFilterProbeRow = true
} else {
hashJoinPlan.IsFilterProbeRow = false
if join.Typ == ast.LeftJoin {
hashJoinPlan.IsReversedColumn = true
setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
} else if join.Typ == ast.RightJoin {
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
} else {
return nil, errors.New("not support Join Type")
}
}
```
Updated code:
```suggestion
switch join.Typ {
case ast.InnerJoin:
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
hashJoinPlan.IsFilterProbeRow = true
case ast.LeftJoin:
hashJoinPlan.IsReversedColumn = true
setPlan(hashJoinPlan, rightPlan, leftPlan, rightKey, leftKey)
hashJoinPlan.IsFilterProbeRow = false
case ast.RightJoin:
setPlan(hashJoinPlan, leftPlan, rightPlan, leftKey, rightKey)
hashJoinPlan.IsFilterProbeRow = false
default:
return nil, errors.New("not support Join Type")
}

}
}

var tmpPlan proto.Plan
tmpPlan = hashJoinPlan
tmpPlan = hashJoinPlan
}

var (
analysis selectResult
Expand Down Expand Up @@ -700,6 +729,10 @@ func optimizeJoin(ctx context.Context, o *optimize.Optimizer, stmt *ast.SelectSt
return tmpPlan, nil
}

func shouldSortMergeJoin(leftTblMeta, rightTblMeta *proto.TableMetadata, leftKey, rightKey string) bool {
return leftTblMeta.Indexes[leftKey] != nil && rightTblMeta.Indexes[rightKey] != nil
}

func getSelectFlag(ru *rule.Rule, stmt *ast.SelectStatement) (flag uint32) {
switch len(stmt.From) {
case 1:
Expand Down
63 changes: 35 additions & 28 deletions pkg/runtime/plan/dml/rename.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,6 @@ package dml

import (
"context"
"fmt"
)

import (
Expand Down Expand Up @@ -52,38 +51,46 @@ func (rp RenamePlan) ExecIn(ctx context.Context, conn proto.VConn) (proto.Result
}

convFields := func(fields []proto.Field) []proto.Field {
if len(rp.RenameList) != len(fields) {
panic(fmt.Sprintf("the length of field doesn't match: expect=%d, actual=%d!", len(rp.RenameList), len(fields)))
}
//if len(rp.RenameList) != len(fields) {
// panic(fmt.Sprintf("the length of field doesn't match: expect=%d, actual=%d!", len(rp.RenameList), len(fields)))
//}
Comment on lines +54 to +56
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Remove commented-out code

Consider removing the commented-out code to clean up the codebase.

-	//if len(rp.RenameList) != len(fields) {
-	//	panic(fmt.Sprintf("the length of field doesn't match: expect=%d, actual=%d!", len(rp.RenameList), len(fields)))
-	//}
Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
//if len(rp.RenameList) != len(fields) {
// panic(fmt.Sprintf("the length of field doesn't match: expect=%d, actual=%d!", len(rp.RenameList), len(fields)))
//}


var renames map[int]struct{}
newFields := make([]proto.Field, 0, len(fields))
for i := 0; i < len(rp.RenameList); i++ {
rename := rp.RenameList[i]
name := fields[i].Name()
if rename == name {
continue
}
if renames == nil {
renames = make(map[int]struct{})
}
renames[i] = struct{}{}
f := *(fields[i].(*mysql.Field))
f.SetName(rp.RenameList[i])
f.SetOrgName(rp.RenameList[i])
newFields = append(newFields, &f)
}

if len(renames) < 1 {
return fields
}
// var renames map[int]struct{}
// for i := 0; i < len(rp.RenameList); i++ {
// rename := rp.RenameList[i]
// name := fields[i].Name()
// if rename == name {
// continue
// }
// if renames == nil {
// renames = make(map[int]struct{})
// }
// renames[i] = struct{}{}
// }

newFields := make([]proto.Field, 0, len(fields))
for i := 0; i < len(fields); i++ {
if _, ok := renames[i]; ok {
f := *(fields[i].(*mysql.Field))
f.SetName(rp.RenameList[i])
f.SetOrgName(rp.RenameList[i])
newFields = append(newFields, &f)
} else {
newFields = append(newFields, fields[i])
}
}
// if len(renames) < 1 {
// return fields
// }

// newFields := make([]proto.Field, 0, len(fields))
// for i := 0; i < len(fields); i++ {
// if _, ok := renames[i]; ok {
// f := *(fields[i].(*mysql.Field))
// f.SetName(rp.RenameList[i])
// f.SetOrgName(rp.RenameList[i])
// newFields = append(newFields, &f)
// } else {
// newFields = append(newFields, fields[i])
// }
// }
Comment on lines +66 to +93
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Remove commented-out code

Consider removing the commented-out code to clean up the codebase.

-	// var renames map[int]struct{}
-	// for i := 0; i < len(rp.RenameList); i++ {
-	// 	rename := rp.RenameList[i]
-	// 	name := fields[i].Name()
-	// 	if rename == name {
-	// 		continue
-	// 	}
-	// 	if renames == nil {
-	// 		renames = make(map[int]struct{})
-	// 	}
-	// 	renames[i] = struct{}{}
-	// }
-	// if len(renames) < 1 {
-	// 	return fields
-	// }
-	// newFields := make([]proto.Field, 0, len(fields))
-	// for i := 0; i < len(fields); i++ {
-	// 	if _, ok := renames[i]; ok {
-	// 		f := *(fields[i].(*mysql.Field))
-	// 		f.SetName(rp.RenameList[i])
-	// 		f.SetOrgName(rp.RenameList[i])
-	// 		newFields = append(newFields, &f)
-	// 	} else {
-	// 		newFields = append(newFields, fields[i])
-	// 	}
-	// }
Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
// var renames map[int]struct{}
// for i := 0; i < len(rp.RenameList); i++ {
// rename := rp.RenameList[i]
// name := fields[i].Name()
// if rename == name {
// continue
// }
// if renames == nil {
// renames = make(map[int]struct{})
// }
// renames[i] = struct{}{}
// }
newFields := make([]proto.Field, 0, len(fields))
for i := 0; i < len(fields); i++ {
if _, ok := renames[i]; ok {
f := *(fields[i].(*mysql.Field))
f.SetName(rp.RenameList[i])
f.SetOrgName(rp.RenameList[i])
newFields = append(newFields, &f)
} else {
newFields = append(newFields, fields[i])
}
}
// if len(renames) < 1 {
// return fields
// }
// newFields := make([]proto.Field, 0, len(fields))
// for i := 0; i < len(fields); i++ {
// if _, ok := renames[i]; ok {
// f := *(fields[i].(*mysql.Field))
// f.SetName(rp.RenameList[i])
// f.SetOrgName(rp.RenameList[i])
// newFields = append(newFields, &f)
// } else {
// newFields = append(newFields, fields[i])
// }
// }

return newFields
}

Expand Down
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