31 lines
863 B
Go
31 lines
863 B
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 optimizer
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import "github.com/pingcap/tidb/ast"
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// validator is an ast.Visitor that validates
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// ast parsed from parser.
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type validator struct {
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err error
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}
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func (v *validator) Enter(in ast.Node) (out ast.Node, skipChildren bool) {
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return in, false
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}
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func (v *validator) Leave(in ast.Node) (out ast.Node, ok bool) {
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return in, true
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}
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