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| // 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. | ||
|
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| package bindinfo | ||
|
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| import "github.com/pingcap/parser/ast" | ||
|
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| // BindHint will add hints for originStmt according to hintedStmt' hints. | ||
| func BindHint(originStmt, hintedStmt ast.StmtNode) ast.StmtNode { | ||
| switch x := originStmt.(type) { | ||
| case *ast.SelectStmt: | ||
| return selectBind(x, hintedStmt.(*ast.SelectStmt)) | ||
| default: | ||
| return originStmt | ||
| } | ||
| } | ||
|
|
||
| func selectBind(originalNode, hintedNode *ast.SelectStmt) *ast.SelectStmt { | ||
| if hintedNode.TableHints != nil { | ||
| originalNode.TableHints = hintedNode.TableHints | ||
| } | ||
| if originalNode.From != nil { | ||
| originalNode.From.TableRefs = resultSetNodeBind(originalNode.From.TableRefs, hintedNode.From.TableRefs).(*ast.Join) | ||
| } | ||
| if originalNode.Where != nil { | ||
| originalNode.Where = exprBind(originalNode.Where, hintedNode.Where).(ast.ExprNode) | ||
| } | ||
|
|
||
| if originalNode.Having != nil { | ||
| originalNode.Having.Expr = exprBind(originalNode.Having.Expr, hintedNode.Having.Expr) | ||
| } | ||
|
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| if originalNode.OrderBy != nil { | ||
| originalNode.OrderBy = orderByBind(originalNode.OrderBy, hintedNode.OrderBy) | ||
| } | ||
|
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| if originalNode.Fields != nil { | ||
| origFields := originalNode.Fields.Fields | ||
| hintFields := hintedNode.Fields.Fields | ||
| for idx := range origFields { | ||
| origFields[idx].Expr = exprBind(origFields[idx].Expr, hintFields[idx].Expr) | ||
| } | ||
| } | ||
| return originalNode | ||
| } | ||
|
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| func orderByBind(originalNode, hintedNode *ast.OrderByClause) *ast.OrderByClause { | ||
| for idx := 0; idx < len(originalNode.Items); idx++ { | ||
| originalNode.Items[idx].Expr = exprBind(originalNode.Items[idx].Expr, hintedNode.Items[idx].Expr) | ||
| } | ||
| return originalNode | ||
| } | ||
|
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| func exprBind(originalNode, hintedNode ast.ExprNode) ast.ExprNode { | ||
| switch v := originalNode.(type) { | ||
| case *ast.SubqueryExpr: | ||
| if v.Query != nil { | ||
| v.Query = resultSetNodeBind(v.Query, hintedNode.(*ast.SubqueryExpr).Query) | ||
| } | ||
| case *ast.ExistsSubqueryExpr: | ||
| if v.Sel != nil { | ||
| v.Sel.(*ast.SubqueryExpr).Query = resultSetNodeBind(v.Sel.(*ast.SubqueryExpr).Query, hintedNode.(*ast.ExistsSubqueryExpr).Sel.(*ast.SubqueryExpr).Query) | ||
| } | ||
| case *ast.PatternInExpr: | ||
| if v.Sel != nil { | ||
| v.Sel.(*ast.SubqueryExpr).Query = resultSetNodeBind(v.Sel.(*ast.SubqueryExpr).Query, hintedNode.(*ast.PatternInExpr).Sel.(*ast.SubqueryExpr).Query) | ||
| } | ||
| case *ast.BinaryOperationExpr: | ||
| if v.L != nil { | ||
| v.L = exprBind(v.L, hintedNode.(*ast.BinaryOperationExpr).L) | ||
| } | ||
| if v.R != nil { | ||
| v.R = exprBind(v.R, hintedNode.(*ast.BinaryOperationExpr).R) | ||
| } | ||
| case *ast.IsNullExpr: | ||
| if v.Expr != nil { | ||
| v.Expr = exprBind(v.Expr, hintedNode.(*ast.IsNullExpr).Expr) | ||
| } | ||
| case *ast.IsTruthExpr: | ||
| if v.Expr != nil { | ||
| v.Expr = exprBind(v.Expr, hintedNode.(*ast.IsTruthExpr).Expr) | ||
| } | ||
| case *ast.PatternLikeExpr: | ||
| if v.Pattern != nil { | ||
| v.Pattern = exprBind(v.Pattern, hintedNode.(*ast.PatternLikeExpr).Pattern) | ||
| } | ||
| case *ast.CompareSubqueryExpr: | ||
| if v.L != nil { | ||
| v.L = exprBind(v.L, hintedNode.(*ast.CompareSubqueryExpr).L) | ||
| } | ||
| if v.R != nil { | ||
| v.R = exprBind(v.R, hintedNode.(*ast.CompareSubqueryExpr).R) | ||
| } | ||
| case *ast.BetweenExpr: | ||
| if v.Left != nil { | ||
| v.Left = exprBind(v.Left, hintedNode.(*ast.BetweenExpr).Left) | ||
| } | ||
| if v.Right != nil { | ||
| v.Right = exprBind(v.Right, hintedNode.(*ast.BetweenExpr).Right) | ||
| } | ||
| case *ast.UnaryOperationExpr: | ||
| if v.V != nil { | ||
| v.V = exprBind(v.V, hintedNode.(*ast.UnaryOperationExpr).V) | ||
| } | ||
| case *ast.CaseExpr: | ||
| if v.Value != nil { | ||
| v.Value = exprBind(v.Value, hintedNode.(*ast.CaseExpr).Value) | ||
| } | ||
| if v.ElseClause != nil { | ||
| v.ElseClause = exprBind(v.ElseClause, hintedNode.(*ast.CaseExpr).ElseClause) | ||
| } | ||
| } | ||
| return originalNode | ||
| } | ||
|
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| func resultSetNodeBind(originalNode, hintedNode ast.ResultSetNode) ast.ResultSetNode { | ||
| switch x := originalNode.(type) { | ||
| case *ast.Join: | ||
| return joinBind(x, hintedNode.(*ast.Join)) | ||
| case *ast.TableSource: | ||
| ts, _ := hintedNode.(*ast.TableSource) | ||
| switch v := x.Source.(type) { | ||
| case *ast.SelectStmt: | ||
| x.Source = selectBind(v, ts.Source.(*ast.SelectStmt)) | ||
| case *ast.UnionStmt: | ||
| x.Source = unionSelectBind(v, hintedNode.(*ast.TableSource).Source.(*ast.UnionStmt)) | ||
| case *ast.TableName: | ||
| x.Source.(*ast.TableName).IndexHints = ts.Source.(*ast.TableName).IndexHints | ||
| } | ||
| return x | ||
| case *ast.SelectStmt: | ||
| return selectBind(x, hintedNode.(*ast.SelectStmt)) | ||
| case *ast.UnionStmt: | ||
| return unionSelectBind(x, hintedNode.(*ast.UnionStmt)) | ||
| default: | ||
| return x | ||
| } | ||
| } | ||
|
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| func joinBind(originalNode, hintedNode *ast.Join) *ast.Join { | ||
| if originalNode.Left != nil { | ||
| originalNode.Left = resultSetNodeBind(originalNode.Left, hintedNode.Left) | ||
| } | ||
|
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| if hintedNode.Right != nil { | ||
| originalNode.Right = resultSetNodeBind(originalNode.Right, hintedNode.Right) | ||
| } | ||
|
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| return originalNode | ||
| } | ||
|
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| func unionSelectBind(originalNode, hintedNode *ast.UnionStmt) ast.ResultSetNode { | ||
| selects := originalNode.SelectList.Selects | ||
| for i := len(selects) - 1; i >= 0; i-- { | ||
| originalNode.SelectList.Selects[i] = selectBind(selects[i], hintedNode.SelectList.Selects[i]) | ||
| } | ||
|
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||
| return originalNode | ||
| } |
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