323 lines
10 KiB
Go
323 lines
10 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 core_test
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import (
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"testing"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/parser"
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"github.com/pingcap/tidb/parser/ast"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/parser/mysql"
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"github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/testkit"
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driver "github.com/pingcap/tidb/types/parser_driver"
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"github.com/pingcap/tidb/util/mock"
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"github.com/stretchr/testify/require"
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)
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func TestCacheable(t *testing.T) {
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store := testkit.CreateMockStore(t)
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mockCtx := mock.NewContext()
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mockCtx.GetSessionVars().EnablePlanCacheForParamLimit = true
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("create table t1(a int, b int) partition by range(a) ( partition p0 values less than (6), partition p1 values less than (11) )")
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tk.MustExec("create table t2(a int, b int) partition by hash(a) partitions 11")
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tk.MustExec("create table t3(a int, b int)")
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tbl := &ast.TableName{Schema: model.NewCIStr("test"), Name: model.NewCIStr("t3")}
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is := tk.Session().GetInfoSchema().(infoschema.InfoSchema)
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// test non-SelectStmt/-InsertStmt/-DeleteStmt/-UpdateStmt/-SetOprStmt
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var stmt ast.Node = &ast.ShowStmt{}
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require.False(t, core.Cacheable(stmt, is))
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stmt = &ast.LoadDataStmt{}
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require.False(t, core.Cacheable(stmt, is))
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// test SetOprStmt
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stmt = &ast.SetOprStmt{}
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require.True(t, core.Cacheable(stmt, is))
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tableRefsClause := &ast.TableRefsClause{TableRefs: &ast.Join{Left: &ast.TableSource{Source: tbl}}}
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// test InsertStmt
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stmt = &ast.InsertStmt{Table: tableRefsClause} // insert-values-stmt
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require.False(t, core.Cacheable(stmt, is))
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stmt = &ast.InsertStmt{Table: tableRefsClause, Select: &ast.SelectStmt{}} // insert-select-stmt
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require.True(t, core.Cacheable(stmt, is))
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// test DeleteStmt
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whereExpr := &ast.FuncCallExpr{}
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stmt = &ast.DeleteStmt{
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TableRefs: tableRefsClause,
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Where: whereExpr,
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}
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require.True(t, core.Cacheable(stmt, is))
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for funcName := range expression.UnCacheableFunctions {
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whereExpr.FnName = model.NewCIStr(funcName)
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require.False(t, core.Cacheable(stmt, is))
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}
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whereExpr.FnName = model.NewCIStr(ast.Rand)
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require.True(t, core.Cacheable(stmt, is))
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stmt = &ast.DeleteStmt{
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TableRefs: tableRefsClause,
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Where: &ast.ExistsSubqueryExpr{},
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}
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require.False(t, core.Cacheable(stmt, is))
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limitStmt := &ast.Limit{
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Count: &driver.ParamMarkerExpr{},
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}
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stmt = &ast.DeleteStmt{
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TableRefs: tableRefsClause,
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Limit: limitStmt,
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}
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c, _ := core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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limitStmt = &ast.Limit{
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Offset: &driver.ParamMarkerExpr{},
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}
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stmt = &ast.DeleteStmt{
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TableRefs: tableRefsClause,
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Limit: limitStmt,
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}
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c, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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limitStmt = &ast.Limit{}
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stmt = &ast.DeleteStmt{
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TableRefs: tableRefsClause,
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Limit: limitStmt,
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}
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c, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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stmt.(*ast.DeleteStmt).TableHints = append(stmt.(*ast.DeleteStmt).TableHints, &ast.TableOptimizerHint{
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HintName: model.NewCIStr(core.HintIgnorePlanCache),
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})
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require.False(t, core.Cacheable(stmt, is))
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// test UpdateStmt
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whereExpr = &ast.FuncCallExpr{}
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stmt = &ast.UpdateStmt{
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TableRefs: tableRefsClause,
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Where: whereExpr,
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}
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require.True(t, core.Cacheable(stmt, is))
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for funcName := range expression.UnCacheableFunctions {
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whereExpr.FnName = model.NewCIStr(funcName)
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require.False(t, core.Cacheable(stmt, is))
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}
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whereExpr.FnName = model.NewCIStr(ast.Rand)
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require.True(t, core.Cacheable(stmt, is))
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stmt = &ast.UpdateStmt{
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TableRefs: tableRefsClause,
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Where: &ast.ExistsSubqueryExpr{},
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}
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require.False(t, core.Cacheable(stmt, is))
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limitStmt = &ast.Limit{
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Count: &driver.ParamMarkerExpr{},
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}
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stmt = &ast.UpdateStmt{
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TableRefs: tableRefsClause,
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Limit: limitStmt,
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}
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c, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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limitStmt = &ast.Limit{
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Offset: &driver.ParamMarkerExpr{},
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}
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stmt = &ast.UpdateStmt{
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TableRefs: tableRefsClause,
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Limit: limitStmt,
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}
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c, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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limitStmt = &ast.Limit{}
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stmt = &ast.UpdateStmt{
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TableRefs: tableRefsClause,
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Limit: limitStmt,
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}
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c, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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stmt.(*ast.UpdateStmt).TableHints = append(stmt.(*ast.UpdateStmt).TableHints, &ast.TableOptimizerHint{
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HintName: model.NewCIStr(core.HintIgnorePlanCache),
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})
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require.False(t, core.Cacheable(stmt, is))
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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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require.True(t, core.Cacheable(stmt, is))
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for funcName := range expression.UnCacheableFunctions {
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whereExpr.FnName = model.NewCIStr(funcName)
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require.False(t, core.Cacheable(stmt, is))
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}
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whereExpr.FnName = model.NewCIStr(ast.Rand)
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require.True(t, core.Cacheable(stmt, is))
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stmt = &ast.SelectStmt{
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Where: &ast.ExistsSubqueryExpr{},
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}
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require.False(t, core.Cacheable(stmt, is))
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limitStmt = &ast.Limit{
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Count: &driver.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, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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limitStmt = &ast.Limit{
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Offset: &driver.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, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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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, _ = core.CacheableWithCtx(mockCtx, stmt, is)
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require.True(t, c)
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paramExpr := &driver.ParamMarkerExpr{}
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orderByClause := &ast.OrderByClause{Items: []*ast.ByItem{{Expr: paramExpr}}}
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stmt = &ast.SelectStmt{
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OrderBy: orderByClause,
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}
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require.False(t, core.Cacheable(stmt, is))
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valExpr := &driver.ValueExpr{}
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orderByClause = &ast.OrderByClause{Items: []*ast.ByItem{{Expr: valExpr}}}
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stmt = &ast.SelectStmt{
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OrderBy: orderByClause,
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}
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require.True(t, core.Cacheable(stmt, is))
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stmt.(*ast.SelectStmt).TableHints = append(stmt.(*ast.SelectStmt).TableHints, &ast.TableOptimizerHint{
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HintName: model.NewCIStr(core.HintIgnorePlanCache),
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})
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require.False(t, core.Cacheable(stmt, is))
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boundExpr := &ast.FrameBound{Expr: &driver.ParamMarkerExpr{}}
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require.False(t, core.Cacheable(boundExpr, is))
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// Partition table can not be cached.
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join := &ast.Join{
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Left: &ast.TableName{Schema: model.NewCIStr("test"), Name: model.NewCIStr("t1")},
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Right: &ast.TableName{Schema: model.NewCIStr("test"), Name: model.NewCIStr("t2")},
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}
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stmt = &ast.SelectStmt{
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From: &ast.TableRefsClause{
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TableRefs: join,
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},
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}
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require.False(t, core.Cacheable(stmt, is))
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join = &ast.Join{
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Left: &ast.TableName{Schema: model.NewCIStr("test"), Name: model.NewCIStr("t3")},
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}
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stmt = &ast.SelectStmt{
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From: &ast.TableRefsClause{
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TableRefs: join,
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},
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}
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require.True(t, core.Cacheable(stmt, is))
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}
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func TestNonPreparedPlanCacheable(t *testing.T) {
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store := testkit.CreateMockStore(t)
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("create table t1(a int, b int, index idx_b(b)) partition by range(a) ( partition p0 values less than (6), partition p1 values less than (11) )")
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tk.MustExec("create table t2(a int, b int) partition by hash(a) partitions 11")
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tk.MustExec("create table t3(a int, b int)")
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is := tk.Session().GetInfoSchema().(infoschema.InfoSchema)
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p := parser.New()
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charset := mysql.DefaultCharset
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collation := mysql.DefaultCollationName
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supported := []string{
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"select * from t where a<10",
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"select * from t where a<13 and b<15",
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"select * from t where b=13",
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"select * from t where c<8",
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"select * from t where d>8",
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"select * from t where c=8 and d>10",
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"select * from t where a<12 and b<13 and c<12 and d>2",
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"select * from t where a in (1, 2, 3)",
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"select * from t where a<13 or b<15",
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"select * from t where a<13 or b<15 and c=13",
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}
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unsupported := []string{
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"select /*+ use_index(t1, idx_b) */ * from t1 where a > 1 and b < 2", // hint
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"select distinct a from t1 where a > 1 and b < 2", // distinct
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"select count(*) from t1 where a > 1 and b < 2 group by a", // group by
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"select a, sum(b) as c from t1 where a > 1 and b < 2 group by a having sum(b) > 1", // having
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"select * from t1 limit 1", // limit
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"select * from t1 order by a", // order by
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"select * from t1, t2", // join
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"select * from (select * from t1) t", // sub-query
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"insert into t1 values(1, 1)", // insert
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"insert into t1(a, b) select a, b from t1", // insert into select
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"update t1 set a = 1 where b = 2", // update
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"delete from t1 where b = 1", // delete
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"select * from t where a+b=13", // '+'
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"select * from t where mod(a, 3)=1", // mod
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"select * from t where d>now()", // now
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}
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for _, q := range unsupported {
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stmt, err := p.ParseOneStmt(q, charset, collation)
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require.NoError(t, err)
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require.False(t, core.NonPreparedPlanCacheable(stmt, is))
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}
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for _, q := range supported {
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stmt, err := p.ParseOneStmt(q, charset, collation)
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require.NoError(t, err)
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require.True(t, core.NonPreparedPlanCacheable(stmt, is))
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}
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}
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