950583eaf8
* plan, tidb-server: add a flag to control statistic info reading. * pass test. * address comment
87 lines
2.5 KiB
Go
87 lines
2.5 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 plan_test
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import (
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb"
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"github.com/pingcap/tidb/context"
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"github.com/pingcap/tidb/plan"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/util/testkit"
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"github.com/pingcap/tidb/util/testleak"
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)
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var _ = Suite(&testAnalyzeSuite{})
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type testAnalyzeSuite struct {
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}
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func (s *testAnalyzeSuite) TestAnalyze(c *C) {
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plan.EnableStatistic = true
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defer func() {
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testleak.AfterTest(c)()
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plan.EnableStatistic = false
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}()
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store, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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defer store.Close()
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testKit := testkit.NewTestKit(c, store)
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testKit.MustExec("use test")
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testKit.MustExec("create table t (a int, b int)")
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testKit.MustExec("create index a on t (a)")
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testKit.MustExec("create index b on t (b)")
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testKit.MustExec("insert into t (a,b) values (1,1),(1,2),(1,3),(1,4),(2,5),(2,6),(2,7),(2,8)")
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testKit.MustExec("analyze table t")
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testKit.MustExec("create table t1 (a int, b int)")
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testKit.MustExec("create index a on t1 (a)")
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testKit.MustExec("create index b on t1 (b)")
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testKit.MustExec("insert into t1 (a,b) values (1,1),(1,2),(1,3),(1,4),(2,5),(2,6),(2,7),(2,8)")
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cases := []struct {
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sql string
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best string
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}{
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{
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sql: "select * from t where t.a <= 2",
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best: "Table(t)",
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},
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{
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sql: "select * from t where t.a = 1 and t.b <= 2",
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best: "Index(t.b)[[-inf,2]]",
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},
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{
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sql: "select * from t1 where t1.a <= 2",
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best: "Index(t1.a)[[-inf,2]]",
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},
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{
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sql: "select * from t1 where t1.a = 1 and t1.b <= 2",
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best: "Index(t1.a)[[1,1]]",
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},
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}
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for _, ca := range cases {
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ctx := testKit.Se.(context.Context)
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stmts, err := tidb.Parse(ctx, ca.sql)
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c.Assert(err, IsNil)
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c.Assert(stmts, HasLen, 1)
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stmt := stmts[0]
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is := sessionctx.GetDomain(ctx).InfoSchema()
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err = plan.ResolveName(stmt, is, ctx)
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c.Assert(err, IsNil)
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err = plan.InferType(ctx.GetSessionVars().StmtCtx, stmt)
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c.Assert(err, IsNil)
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p, err := plan.Optimize(ctx, stmt, is)
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c.Assert(plan.ToString(p), Equals, ca.best, Commentf("for %s", ca.sql))
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}
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}
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