53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
// Copyright 2017 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 expression
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import (
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"github.com/pingcap/tidb/ast"
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)
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// UnCacheableFunctions stores functions which can not be cached to plan cache.
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var UnCacheableFunctions = map[string]struct{}{
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ast.Now: {},
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ast.CurrentTimestamp: {},
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ast.UTCTime: {},
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ast.Curtime: {},
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ast.CurrentTime: {},
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ast.UTCTimestamp: {},
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ast.UnixTimestamp: {},
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ast.Sysdate: {},
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ast.Curdate: {},
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ast.CurrentDate: {},
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ast.UTCDate: {},
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ast.Database: {},
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ast.CurrentUser: {},
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ast.User: {},
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ast.ConnectionID: {},
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ast.LastInsertId: {},
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ast.Version: {},
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}
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// unFoldableFunctions stores functions which can not be folded duration constant folding stage.
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var unFoldableFunctions = map[string]struct{}{
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ast.FoundRows: {},
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ast.Rand: {},
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ast.UUID: {},
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ast.Sleep: {},
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ast.RowFunc: {},
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ast.Values: {},
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ast.SetVar: {},
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ast.GetVar: {},
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ast.GetParam: {},
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}
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