90 lines
2.0 KiB
Go
90 lines
2.0 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 plan
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import (
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/model"
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)
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var _ = Suite(&testCacheableSuite{})
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type testCacheableSuite struct {
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}
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func (s *testCacheableSuite) TestCacheable(c *C) {
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// test non-SelectStmt
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var stmt ast.Node = &ast.DeleteStmt{}
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c.Assert(Cacheable(stmt), IsFalse)
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stmt = &ast.InsertStmt{}
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c.Assert(Cacheable(stmt), IsFalse)
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stmt = &ast.UnionStmt{}
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c.Assert(Cacheable(stmt), IsFalse)
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stmt = &ast.UpdateStmt{}
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c.Assert(Cacheable(stmt), IsFalse)
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stmt = &ast.ShowStmt{}
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c.Assert(Cacheable(stmt), IsFalse)
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stmt = &ast.LoadDataStmt{}
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c.Assert(Cacheable(stmt), IsFalse)
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// test SelectStmt
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whereExpr := &ast.FuncCallExpr{}
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stmt = &ast.SelectStmt{
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Where: whereExpr,
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}
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c.Assert(Cacheable(stmt), IsTrue)
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for funcName := range expression.UnCacheableFunctions {
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whereExpr.FnName = model.NewCIStr(funcName)
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c.Assert(Cacheable(stmt), IsFalse)
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}
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whereExpr.FnName = model.NewCIStr(ast.Rand)
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c.Assert(Cacheable(stmt), IsTrue)
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stmt = &ast.SelectStmt{
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Where: &ast.ExistsSubqueryExpr{},
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}
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c.Assert(Cacheable(stmt), IsFalse)
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limitStmt := &ast.Limit{
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Count: &ast.ParamMarkerExpr{},
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}
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stmt = &ast.SelectStmt{
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Limit: limitStmt,
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}
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c.Assert(Cacheable(stmt), IsFalse)
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limitStmt = &ast.Limit{
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Offset: &ast.ParamMarkerExpr{},
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}
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stmt = &ast.SelectStmt{
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Limit: limitStmt,
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}
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c.Assert(Cacheable(stmt), IsFalse)
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limitStmt = &ast.Limit{}
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stmt = &ast.SelectStmt{
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Limit: limitStmt,
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}
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c.Assert(Cacheable(stmt), IsTrue)
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}
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