93 lines
2.5 KiB
Go
93 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 executor_test
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import (
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"fmt"
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"strings"
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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/executor"
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"github.com/pingcap/tidb/util/testkit"
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"github.com/pingcap/tidb/util/testleak"
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"github.com/pingcap/tidb/util/types"
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)
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func (s *testSuite) TestAnalyzeTable(c *C) {
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defer func() {
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testleak.AfterTest(c)()
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}()
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tk := testkit.NewTestKit(c, s.store)
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tk.MustExec("use test")
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tk.MustExec("drop table if exists t1")
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tk.MustExec("create table t1 (a int)")
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tk.MustExec("create index ind_a on t1 (a)")
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tk.MustExec("insert into t1 (a) values (1)")
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result := tk.MustQuery("explain select * from t1 where t1.a = 1")
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rowStr := fmt.Sprintf("%s", result.Rows())
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c.Check(strings.Split(rowStr, "{")[0], Equals, "[[IndexScan_5 ")
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tk.MustExec("analyze table t1")
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result = tk.MustQuery("explain select * from t1 where t1.a = 1")
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rowStr = fmt.Sprintf("%s", result.Rows())
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c.Check(strings.Split(rowStr, "{")[0], Equals, "[[TableScan_4 ")
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}
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type recordSet struct {
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data []types.Datum
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count int
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cursor int
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}
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func (r *recordSet) Fields() ([]*ast.ResultField, error) {
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return nil, nil
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}
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func (r *recordSet) Next() (*ast.Row, error) {
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if r.cursor == r.count {
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return nil, nil
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}
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r.cursor++
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return &ast.Row{Data: []types.Datum{r.data[r.cursor-1]}}, nil
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}
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func (r *recordSet) Close() error {
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r.cursor = 0
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return nil
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}
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func (s *testSuite) TestCollectSamplesAndEstimateNDVs(c *C) {
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count := 10000
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rs := &recordSet{
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data: make([]types.Datum, count),
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count: count,
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cursor: 0,
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}
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start := 1000 // 1000 values is null
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for i := start; i < rs.count; i++ {
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rs.data[i].SetInt64(int64(i))
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}
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for i := start; i < rs.count; i += 3 {
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rs.data[i].SetInt64(rs.data[i].GetInt64() + 1)
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}
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for i := start; i < rs.count; i += 5 {
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rs.data[i].SetInt64(rs.data[i].GetInt64() + 2)
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}
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cnt, _, ndvs, err := executor.CollectSamplesAndEstimateNDVs(rs, 1)
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c.Assert(err, IsNil)
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c.Assert(cnt, Equals, int64(rs.count))
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c.Assert(ndvs[0], Equals, int64(6624))
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}
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