750 lines
17 KiB
Go
750 lines
17 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ast
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import (
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"regexp"
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"github.com/pingcap/tidb/context"
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"github.com/pingcap/tidb/model"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/parser/opcode"
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"github.com/pingcap/tidb/util/types"
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)
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var (
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_ ExprNode = &BetweenExpr{}
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_ ExprNode = &BinaryOperationExpr{}
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_ ExprNode = &CaseExpr{}
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_ ExprNode = &ColumnNameExpr{}
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_ ExprNode = &CompareSubqueryExpr{}
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_ ExprNode = &DefaultExpr{}
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_ ExprNode = &ExistsSubqueryExpr{}
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_ ExprNode = &IsNullExpr{}
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_ ExprNode = &IsTruthExpr{}
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_ ExprNode = &ParamMarkerExpr{}
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_ ExprNode = &ParenthesesExpr{}
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_ ExprNode = &PatternInExpr{}
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_ ExprNode = &PatternLikeExpr{}
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_ ExprNode = &PatternRegexpExpr{}
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_ ExprNode = &PositionExpr{}
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_ ExprNode = &RowExpr{}
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_ ExprNode = &SubqueryExpr{}
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_ ExprNode = &UnaryOperationExpr{}
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_ ExprNode = &ValueExpr{}
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_ ExprNode = &ValuesExpr{}
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_ ExprNode = &VariableExpr{}
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_ Node = &ColumnName{}
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_ Node = &WhenClause{}
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)
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// ValueExpr is the simple value expression.
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type ValueExpr struct {
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exprNode
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}
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// NewValueExpr creates a ValueExpr with value, and sets default field type.
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func NewValueExpr(value interface{}) *ValueExpr {
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if ve, ok := value.(*ValueExpr); ok {
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return ve
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}
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ve := &ValueExpr{}
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ve.SetValue(value)
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if _, ok := value.(UnquoteString); ok {
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ve.Type = types.NewFieldType(mysql.TypeVarchar)
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ve.Type.Charset = mysql.DefaultCharset
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ve.Type.Collate = mysql.DefaultCollationName
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return ve
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}
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ve.Type = types.DefaultTypeForValue(value)
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return ve
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}
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// Accept implements Node interface.
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func (n *ValueExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*ValueExpr)
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return v.Leave(n)
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}
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// BetweenExpr is for "between and" or "not between and" expression.
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type BetweenExpr struct {
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exprNode
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// Expr is the expression to be checked.
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Expr ExprNode
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// Left is the expression for minimal value in the range.
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Left ExprNode
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// Right is the expression for maximum value in the range.
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Right ExprNode
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// Not is true, the expression is "not between and".
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Not bool
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}
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// Accept implements Node interface.
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func (n *BetweenExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*BetweenExpr)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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node, ok = n.Left.Accept(v)
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if !ok {
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return n, false
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}
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n.Left = node.(ExprNode)
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node, ok = n.Right.Accept(v)
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if !ok {
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return n, false
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}
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n.Right = node.(ExprNode)
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return v.Leave(n)
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}
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// BinaryOperationExpr is for binary operation like `1 + 1`, `1 - 1`, etc.
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type BinaryOperationExpr struct {
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exprNode
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// Op is the operator code for BinaryOperation.
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Op opcode.Op
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// L is the left expression in BinaryOperation.
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L ExprNode
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// R is the right expression in BinaryOperation.
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R ExprNode
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}
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// Accept implements Node interface.
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func (n *BinaryOperationExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*BinaryOperationExpr)
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node, ok := n.L.Accept(v)
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if !ok {
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return n, false
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}
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n.L = node.(ExprNode)
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node, ok = n.R.Accept(v)
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if !ok {
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return n, false
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}
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n.R = node.(ExprNode)
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return v.Leave(n)
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}
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// WhenClause is the when clause in Case expression for "when condition then result".
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type WhenClause struct {
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node
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// Expr is the condition expression in WhenClause.
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Expr ExprNode
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// Result is the result expression in WhenClause.
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Result ExprNode
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}
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// Accept implements Node Accept interface.
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func (n *WhenClause) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*WhenClause)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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node, ok = n.Result.Accept(v)
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if !ok {
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return n, false
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}
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n.Result = node.(ExprNode)
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return v.Leave(n)
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}
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// CaseExpr is the case expression.
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type CaseExpr struct {
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exprNode
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// Value is the compare value expression.
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Value ExprNode
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// WhenClauses is the condition check expression.
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WhenClauses []*WhenClause
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// ElseClause is the else result expression.
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ElseClause ExprNode
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}
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// Accept implements Node Accept interface.
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func (n *CaseExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*CaseExpr)
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if n.Value != nil {
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node, ok := n.Value.Accept(v)
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if !ok {
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return n, false
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}
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n.Value = node.(ExprNode)
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}
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for i, val := range n.WhenClauses {
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node, ok := val.Accept(v)
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if !ok {
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return n, false
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}
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n.WhenClauses[i] = node.(*WhenClause)
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}
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if n.ElseClause != nil {
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node, ok := n.ElseClause.Accept(v)
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if !ok {
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return n, false
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}
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n.ElseClause = node.(ExprNode)
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}
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return v.Leave(n)
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}
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// SubqueryExec represents a subquery executor interface.
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// This interface is implemented in executor and used in plan/evaluator.
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// It will execute the subselect and get the result.
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type SubqueryExec interface {
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ExprNode
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// EvalRows executes the subquery and returns the multi rows with rowCount.
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// rowCount < 0 means no limit.
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// If the ColumnCount is 1, we will return a column result like {1, 2, 3},
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// otherwise, we will return a table result like {{1, 1}, {2, 2}}.
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EvalRows(ctx context.Context, rowCount int) ([]interface{}, error)
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// ColumnCount returns column count for the sub query.
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ColumnCount() (int, error)
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}
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// SubqueryExpr represents a subquery.
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type SubqueryExpr struct {
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exprNode
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// Query is the query SelectNode.
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Query ResultSetNode
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SubqueryExec SubqueryExec
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Evaluated bool
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UseOuterContext bool
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}
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// Accept implements Node Accept interface.
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func (n *SubqueryExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*SubqueryExpr)
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if n.SubqueryExec != nil {
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t, ok := n.SubqueryExec.Accept(v)
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if !ok {
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return n, false
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}
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sq, ok := t.(SubqueryExec)
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if !ok {
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return n, false
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}
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n.SubqueryExec = sq
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return v.Leave(n)
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}
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node, ok := n.Query.Accept(v)
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if !ok {
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return n, false
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}
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n.Query = node.(ResultSetNode)
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return v.Leave(n)
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}
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// SetResultFields implements ResultSetNode interface.
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func (n *SubqueryExpr) SetResultFields(rfs []*ResultField) {
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n.Query.SetResultFields(rfs)
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}
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// GetResultFields implements ResultSetNode interface.
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func (n *SubqueryExpr) GetResultFields() []*ResultField {
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return n.Query.GetResultFields()
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}
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// CompareSubqueryExpr is the expression for "expr cmp (select ...)".
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// See: https://dev.mysql.com/doc/refman/5.7/en/comparisons-using-subqueries.html
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// See: https://dev.mysql.com/doc/refman/5.7/en/any-in-some-subqueries.html
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// See: https://dev.mysql.com/doc/refman/5.7/en/all-subqueries.html
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type CompareSubqueryExpr struct {
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exprNode
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// L is the left expression
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L ExprNode
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// Op is the comparison opcode.
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Op opcode.Op
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// R is the subquery for right expression, may be rewritten to other type of expression.
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R ExprNode
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// All is true, we should compare all records in subquery.
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All bool
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}
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// Accept implements Node Accept interface.
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func (n *CompareSubqueryExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*CompareSubqueryExpr)
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node, ok := n.L.Accept(v)
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if !ok {
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return n, false
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}
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n.L = node.(ExprNode)
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node, ok = n.R.Accept(v)
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if !ok {
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return n, false
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}
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n.R = node.(ExprNode)
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return v.Leave(n)
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}
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// ColumnName represents column name.
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type ColumnName struct {
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node
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Schema model.CIStr
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Table model.CIStr
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Name model.CIStr
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}
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// Accept implements Node Accept interface.
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func (n *ColumnName) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*ColumnName)
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return v.Leave(n)
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}
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// ColumnNameExpr represents a column name expression.
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type ColumnNameExpr struct {
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exprNode
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// Name is the referenced column name.
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Name *ColumnName
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// Refer is the result field the column name refers to.
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// The value of Refer.Expr is used as the value of the expression.
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Refer *ResultField
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}
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// Accept implements Node Accept interface.
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func (n *ColumnNameExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*ColumnNameExpr)
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node, ok := n.Name.Accept(v)
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if !ok {
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return n, false
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}
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n.Name = node.(*ColumnName)
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return v.Leave(n)
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}
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// DefaultExpr is the default expression using default value for a column.
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type DefaultExpr struct {
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exprNode
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// Name is the column name.
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Name *ColumnName
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}
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// Accept implements Node Accept interface.
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func (n *DefaultExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*DefaultExpr)
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if n.Name != nil {
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node, ok := n.Name.Accept(v)
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if !ok {
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return n, false
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}
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n.Name = node.(*ColumnName)
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}
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return v.Leave(n)
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}
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// ExistsSubqueryExpr is the expression for "exists (select ...)".
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// https://dev.mysql.com/doc/refman/5.7/en/exists-and-not-exists-subqueries.html
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type ExistsSubqueryExpr struct {
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exprNode
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// Sel is the subquery, may be rewritten to other type of expression.
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Sel ExprNode
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}
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// Accept implements Node Accept interface.
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func (n *ExistsSubqueryExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*ExistsSubqueryExpr)
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node, ok := n.Sel.Accept(v)
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if !ok {
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return n, false
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}
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n.Sel = node.(ExprNode)
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return v.Leave(n)
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}
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// PatternInExpr is the expression for in operator, like "expr in (1, 2, 3)" or "expr in (select c from t)".
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type PatternInExpr struct {
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exprNode
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// Expr is the value expression to be compared.
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Expr ExprNode
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// List is the list expression in compare list.
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List []ExprNode
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// Not is true, the expression is "not in".
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Not bool
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// Sel is the subquery, may be rewritten to other type of expression.
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Sel ExprNode
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}
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// Accept implements Node Accept interface.
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func (n *PatternInExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*PatternInExpr)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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for i, val := range n.List {
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node, ok = val.Accept(v)
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if !ok {
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return n, false
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}
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n.List[i] = node.(ExprNode)
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}
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if n.Sel != nil {
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node, ok = n.Sel.Accept(v)
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if !ok {
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return n, false
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}
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n.Sel = node.(ExprNode)
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}
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return v.Leave(n)
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}
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// IsNullExpr is the expression for null check.
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type IsNullExpr struct {
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exprNode
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// Expr is the expression to be checked.
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Expr ExprNode
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// Not is true, the expression is "is not null".
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Not bool
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}
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// Accept implements Node Accept interface.
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func (n *IsNullExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*IsNullExpr)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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return v.Leave(n)
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}
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// IsTruthExpr is the expression for true/false check.
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type IsTruthExpr struct {
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exprNode
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// Expr is the expression to be checked.
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Expr ExprNode
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// Not is true, the expression is "is not true/false".
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Not bool
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// True indicates checking true or false.
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True int64
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}
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// Accept implements Node Accept interface.
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func (n *IsTruthExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*IsTruthExpr)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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return v.Leave(n)
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}
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// PatternLikeExpr is the expression for like operator, e.g, expr like "%123%"
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type PatternLikeExpr struct {
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exprNode
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// Expr is the expression to be checked.
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Expr ExprNode
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// Pattern is the like expression.
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Pattern ExprNode
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// Not is true, the expression is "not like".
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Not bool
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Escape byte
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PatChars []byte
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PatTypes []byte
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}
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// Accept implements Node Accept interface.
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func (n *PatternLikeExpr) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*PatternLikeExpr)
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if n.Expr != nil {
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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}
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if n.Pattern != nil {
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node, ok := n.Pattern.Accept(v)
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if !ok {
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return n, false
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}
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n.Pattern = node.(ExprNode)
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}
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return v.Leave(n)
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}
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// ParamMarkerExpr expression holds a place for another expression.
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// Used in parsing prepare statement.
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type ParamMarkerExpr struct {
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exprNode
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Offset int
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}
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|
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// Accept implements Node Accept interface.
|
|
func (n *ParamMarkerExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*ParamMarkerExpr)
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// ParenthesesExpr is the parentheses expression.
|
|
type ParenthesesExpr struct {
|
|
exprNode
|
|
// Expr is the expression in parentheses.
|
|
Expr ExprNode
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *ParenthesesExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*ParenthesesExpr)
|
|
if n.Expr != nil {
|
|
node, ok := n.Expr.Accept(v)
|
|
if !ok {
|
|
return n, false
|
|
}
|
|
n.Expr = node.(ExprNode)
|
|
}
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// PositionExpr is the expression for order by and group by position.
|
|
// MySQL use position expression started from 1, it looks a little confused inner.
|
|
// maybe later we will use 0 at first.
|
|
type PositionExpr struct {
|
|
exprNode
|
|
// N is the position, started from 1 now.
|
|
N int
|
|
// Refer is the result field the position refers to.
|
|
Refer *ResultField
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *PositionExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*PositionExpr)
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// PatternRegexpExpr is the pattern expression for pattern match.
|
|
type PatternRegexpExpr struct {
|
|
exprNode
|
|
// Expr is the expression to be checked.
|
|
Expr ExprNode
|
|
// Pattern is the expression for pattern.
|
|
Pattern ExprNode
|
|
// Not is true, the expression is "not rlike",
|
|
Not bool
|
|
|
|
// Re is the compiled regexp.
|
|
Re *regexp.Regexp
|
|
// Sexpr is the string for Expr expression.
|
|
Sexpr *string
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *PatternRegexpExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*PatternRegexpExpr)
|
|
node, ok := n.Expr.Accept(v)
|
|
if !ok {
|
|
return n, false
|
|
}
|
|
n.Expr = node.(ExprNode)
|
|
node, ok = n.Pattern.Accept(v)
|
|
if !ok {
|
|
return n, false
|
|
}
|
|
n.Pattern = node.(ExprNode)
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// RowExpr is the expression for row constructor.
|
|
// See https://dev.mysql.com/doc/refman/5.7/en/row-subqueries.html
|
|
type RowExpr struct {
|
|
exprNode
|
|
|
|
Values []ExprNode
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *RowExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*RowExpr)
|
|
for i, val := range n.Values {
|
|
node, ok := val.Accept(v)
|
|
if !ok {
|
|
return n, false
|
|
}
|
|
n.Values[i] = node.(ExprNode)
|
|
}
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// UnaryOperationExpr is the expression for unary operator.
|
|
type UnaryOperationExpr struct {
|
|
exprNode
|
|
// Op is the operator opcode.
|
|
Op opcode.Op
|
|
// V is the unary expression.
|
|
V ExprNode
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *UnaryOperationExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*UnaryOperationExpr)
|
|
node, ok := n.V.Accept(v)
|
|
if !ok {
|
|
return n, false
|
|
}
|
|
n.V = node.(ExprNode)
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// ValuesExpr is the expression used in INSERT VALUES
|
|
type ValuesExpr struct {
|
|
exprNode
|
|
// model.CIStr is column name.
|
|
Column *ColumnNameExpr
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *ValuesExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*ValuesExpr)
|
|
node, ok := n.Column.Accept(v)
|
|
if !ok {
|
|
return n, false
|
|
}
|
|
n.Column = node.(*ColumnNameExpr)
|
|
return v.Leave(n)
|
|
}
|
|
|
|
// VariableExpr is the expression for variable.
|
|
type VariableExpr struct {
|
|
exprNode
|
|
// Name is the variable name.
|
|
Name string
|
|
// IsGlobal indicates whether this variable is global.
|
|
IsGlobal bool
|
|
// IsSystem indicates whether this variable is a system variable in current session.
|
|
IsSystem bool
|
|
}
|
|
|
|
// Accept implements Node Accept interface.
|
|
func (n *VariableExpr) Accept(v Visitor) (Node, bool) {
|
|
newNode, skipChildren := v.Enter(n)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
n = newNode.(*VariableExpr)
|
|
return v.Leave(n)
|
|
}
|