/
chunk_executor.go
63 lines (58 loc) · 1.58 KB
/
chunk_executor.go
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//
// This source code is a modified form of original source from the TiDB project, which has the following copyright header(s):
//
// Copyright 2017 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 expression
import (
"github.com/pingcap/parser/ast"
)
// HasGetSetVarFunc checks whether an expression contains SetVar/GetVar function.
func HasGetSetVarFunc(expr Expression) bool {
scalaFunc, ok := expr.(*ScalarFunction)
if !ok {
return false
}
if scalaFunc.FuncName.L == ast.SetVar {
return true
}
if scalaFunc.FuncName.L == ast.GetVar {
return true
}
for _, arg := range scalaFunc.GetArgs() {
if HasGetSetVarFunc(arg) {
return true
}
}
return false
}
// HasAssignSetVarFunc checks whether an expression contains SetVar function and assign a value
func HasAssignSetVarFunc(expr Expression) bool {
scalaFunc, ok := expr.(*ScalarFunction)
if !ok {
return false
}
if scalaFunc.FuncName.L == ast.SetVar {
for _, arg := range scalaFunc.GetArgs() {
if _, ok := arg.(*ScalarFunction); ok {
return true
}
}
}
for _, arg := range scalaFunc.GetArgs() {
if HasAssignSetVarFunc(arg) {
return true
}
}
return false
}