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constant_propagation_test.go
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// Copyright 2018 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package expression_test
import (
"fmt"
. "github.com/pingcap/check"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/util/mock"
"github.com/pingcap/tidb/util/testkit"
"github.com/pingcap/tidb/util/testleak"
)
var _ = Suite(&testSuite{})
type testSuite struct {
store kv.Storage
dom *domain.Domain
ctx sessionctx.Context
}
func (s *testSuite) cleanEnv(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("use test")
r := tk.MustQuery("show tables")
for _, tb := range r.Rows() {
tableName := tb[0]
tk.MustExec(fmt.Sprintf("drop table %v", tableName))
}
}
func (s *testSuite) SetUpSuite(c *C) {
var err error
testleak.BeforeTest()
s.store, s.dom, err = newStoreWithBootstrap()
c.Assert(err, IsNil)
s.ctx = mock.NewContext()
}
func (s *testSuite) TearDownSuite(c *C) {
s.dom.Close()
s.store.Close()
testleak.AfterTest(c)()
}
func (s *testSuite) TestOuterJoinPropConst(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("use test")
tk.MustExec("drop table if exists t1, t2;")
tk.MustExec("create table t1(id bigint primary key, a int, b int);")
tk.MustExec("create table t2(id bigint primary key, a int, b int);")
// Positive tests.
tk.MustQuery("explain select * from t1 left join t2 on t1.a > t2.a and t1.a = 1;").Check(testkit.Rows(
"HashLeftJoin_6 33233333.33 root left outer join, inner:TableReader_11, left cond:[eq(test.t1.a, 1)]",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 3323.33 root data:Selection_10",
" └─Selection_10 3323.33 cop gt(1, test.t2.a)",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a > t2.a where t1.a = 1;").Check(testkit.Rows(
"HashLeftJoin_7 33233.33 root left outer join, inner:TableReader_13",
"├─TableReader_10 10.00 root data:Selection_9",
"│ └─Selection_9 10.00 cop eq(test.t1.a, 1)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_13 3323.33 root data:Selection_12",
" └─Selection_12 3323.33 cop gt(1, test.t2.a)",
" └─TableScan_11 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a = t2.a and t1.a > 1;").Check(testkit.Rows(
"HashLeftJoin_6 10000.00 root left outer join, inner:TableReader_11, equal:[eq(test.t1.a, test.t2.a)], left cond:[gt(test.t1.a, 1)]",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 3333.33 root data:Selection_10",
" └─Selection_10 3333.33 cop gt(test.t2.a, 1)",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a = t2.a where t1.a > 1;").Check(testkit.Rows(
"HashLeftJoin_7 4166.67 root left outer join, inner:TableReader_13, equal:[eq(test.t1.a, test.t2.a)]",
"├─TableReader_10 3333.33 root data:Selection_9",
"│ └─Selection_9 3333.33 cop gt(test.t1.a, 1)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_13 3333.33 root data:Selection_12",
" └─Selection_12 3333.33 cop gt(test.t2.a, 1)",
" └─TableScan_11 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 right join t2 on t1.a > t2.a where t2.a = 1;").Check(testkit.Rows(
"HashRightJoin_7 33333.33 root right outer join, inner:TableReader_10",
"├─TableReader_10 3333.33 root data:Selection_9",
"│ └─Selection_9 3333.33 cop gt(test.t1.a, 1)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_13 10.00 root data:Selection_12",
" └─Selection_12 10.00 cop eq(test.t2.a, 1)",
" └─TableScan_11 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 right join t2 on t1.a = t2.a where t2.a > 1;").Check(testkit.Rows(
"HashRightJoin_7 4166.67 root right outer join, inner:TableReader_10, equal:[eq(test.t1.a, test.t2.a)]",
"├─TableReader_10 3333.33 root data:Selection_9",
"│ └─Selection_9 3333.33 cop gt(test.t1.a, 1)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_13 3333.33 root data:Selection_12",
" └─Selection_12 3333.33 cop gt(test.t2.a, 1)",
" └─TableScan_11 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 right join t2 on t1.a = t2.a and t2.a > 1;").Check(testkit.Rows(
"HashRightJoin_6 10000.00 root right outer join, inner:TableReader_9, equal:[eq(test.t1.a, test.t2.a)], right cond:gt(test.t2.a, 1)",
"├─TableReader_9 3333.33 root data:Selection_8",
"│ └─Selection_8 3333.33 cop gt(test.t1.a, 1)",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 10000.00 root data:TableScan_10",
" └─TableScan_10 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 right join t2 on t1.a > t2.a and t2.a = 1;").Check(testkit.Rows(
"HashRightJoin_6 33333333.33 root right outer join, inner:TableReader_9, right cond:eq(test.t2.a, 1)",
"├─TableReader_9 3333.33 root data:Selection_8",
"│ └─Selection_8 3333.33 cop gt(test.t1.a, 1)",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 10000.00 root data:TableScan_10",
" └─TableScan_10 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
// Negative tests.
tk.MustQuery("explain select * from t1 left join t2 on t1.a = t2.a and t2.a > 1;").Check(testkit.Rows(
"HashLeftJoin_6 10000.00 root left outer join, inner:TableReader_11, equal:[eq(test.t1.a, test.t2.a)]",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 3333.33 root data:Selection_10",
" └─Selection_10 3333.33 cop gt(test.t2.a, 1)",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a > t2.a and t2.a = 1;").Check(testkit.Rows(
"HashLeftJoin_6 100000.00 root left outer join, inner:TableReader_11, other cond:gt(test.t1.a, test.t2.a)",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 10.00 root data:Selection_10",
" └─Selection_10 10.00 cop eq(test.t2.a, 1)",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 right join t2 on t1.a > t2.a and t1.a = 1;").Check(testkit.Rows(
"HashRightJoin_6 100000.00 root right outer join, inner:TableReader_9, other cond:gt(test.t1.a, test.t2.a)",
"├─TableReader_9 10.00 root data:Selection_8",
"│ └─Selection_8 10.00 cop eq(test.t1.a, 1)",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 10000.00 root data:TableScan_10",
" └─TableScan_10 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 right join t2 on t1.a = t2.a and t1.a > 1;").Check(testkit.Rows(
"HashRightJoin_6 10000.00 root right outer join, inner:TableReader_9, equal:[eq(test.t1.a, test.t2.a)]",
"├─TableReader_9 3333.33 root data:Selection_8",
"│ └─Selection_8 3333.33 cop gt(test.t1.a, 1)",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 10000.00 root data:TableScan_10",
" └─TableScan_10 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a = t1.b and t1.a > 1;").Check(testkit.Rows(
"HashLeftJoin_6 100000000.00 root left outer join, inner:TableReader_10, left cond:[eq(test.t1.a, test.t1.b) gt(test.t1.a, 1)]",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_10 10000.00 root data:TableScan_9",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on t2.a = t2.b and t2.a > 1;").Check(testkit.Rows(
"HashLeftJoin_6 26666666.67 root left outer join, inner:TableReader_11",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 2666.67 root data:Selection_10",
" └─Selection_10 2666.67 cop eq(test.t2.a, test.t2.b), gt(test.t2.a, 1)",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
// Constant equal condition merge in outer join.
tk.MustQuery("explain select * from t1 left join t2 on true where t1.a = 1 and false;").Check(testkit.Rows(
"TableDual_8 0.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on true where t1.a = 1 and null;").Check(testkit.Rows(
"TableDual_8 0.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on true where t1.a = null;").Check(testkit.Rows(
"TableDual_8 0.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on true where t1.a = 1 and t1.a = 2;").Check(testkit.Rows(
"TableDual_8 0.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on true where t1.a = 1 and t1.a = 1;").Check(testkit.Rows(
"HashLeftJoin_7 80000.00 root left outer join, inner:TableReader_12",
"├─TableReader_10 10.00 root data:Selection_9",
"│ └─Selection_9 10.00 cop eq(test.t1.a, 1), eq(test.t1.a, 1)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_12 10000.00 root data:TableScan_11",
" └─TableScan_11 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on false;").Check(testkit.Rows(
"HashLeftJoin_6 80000000.00 root left outer join, inner:TableDual_9",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableDual_9 8000.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a =1 and t1.a = 2;").Check(testkit.Rows(
"HashLeftJoin_6 80000000.00 root left outer join, inner:TableDual_9",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableDual_9 8000.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on t1.a =1 where t1.a = 2;").Check(testkit.Rows(
"HashLeftJoin_7 80000.00 root left outer join, inner:TableDual_11",
"├─TableReader_10 10.00 root data:Selection_9",
"│ └─Selection_9 10.00 cop eq(test.t1.a, 2)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableDual_11 8000.00 root rows:0",
))
tk.MustQuery("explain select * from t1 left join t2 on t2.a = 1 and t2.a = 2;").Check(testkit.Rows(
"HashLeftJoin_6 0.00 root left outer join, inner:TableReader_11",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_11 0.00 root data:Selection_10",
" └─Selection_10 0.00 cop eq(test.t2.a, 1), eq(test.t2.a, 2)",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
// Constant propagation for DNF in outer join.
tk.MustQuery("explain select * from t1 left join t2 on t1.a = 1 or (t1.a = 2 and t1.a = 3);").Check(testkit.Rows(
"HashLeftJoin_6 100000000.00 root left outer join, inner:TableReader_10, left cond:[or(eq(test.t1.a, 1), 0)]",
"├─TableReader_8 10000.00 root data:TableScan_7",
"│ └─TableScan_7 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_10 10000.00 root data:TableScan_9",
" └─TableScan_9 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
tk.MustQuery("explain select * from t1 left join t2 on true where t1.a = 1 or (t1.a = 2 and t1.a = 3);").Check(testkit.Rows(
"HashLeftJoin_7 80000.00 root left outer join, inner:TableReader_12",
"├─TableReader_10 10.00 root data:Selection_9",
"│ └─Selection_9 10.00 cop or(eq(test.t1.a, 1), 0)",
"│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
"└─TableReader_12 10000.00 root data:TableScan_11",
" └─TableScan_11 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
// Constant propagation over left outer semi join, filter with aux column should be be derived.
tk.MustQuery("explain select * from t1 where t1.b > 1 or t1.b in (select b from t2);").Check(testkit.Rows(
"Projection_7 8000.00 root test.t1.id, test.t1.a, test.t1.b",
"└─Selection_8 8000.00 root or(gt(test.t1.b, 1), 5_aux_0)",
" └─HashLeftJoin_9 10000.00 root left outer semi join, inner:TableReader_13, equal:[eq(test.t1.b, test.t2.b)]",
" ├─TableReader_11 10000.00 root data:TableScan_10",
" │ └─TableScan_10 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
" └─TableReader_13 10000.00 root data:TableScan_12",
" └─TableScan_12 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
))
}