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Signed-off-by: Weizhen Wang <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright 2023 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, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package rule | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/pingcap/tidb/pkg/testkit" | ||
| ) | ||
|
|
||
| func TestDual(t *testing.T) { | ||
| store := testkit.CreateMockStore(t) | ||
| tk := testkit.NewTestKit(t, store) | ||
| tk.MustExec("use test") | ||
| tk.MustExec("CREATE TABLE t (id INT PRIMARY KEY AUTO_INCREMENT,d INT);") | ||
| tk.MustQuery("explain select a from (select d as a from t where d = 0) k where k.a = 5").Check(testkit.Rows( | ||
| "TableDual_8 0.00 root rows:0")) | ||
| tk.MustQuery("select a from (select d as a from t where d = 0) k where k.a = 5").Check(testkit.Rows()) | ||
| tk.MustQuery("explain select a from (select 1+2 as a from t where d = 0) k where k.a = 5").Check(testkit.Rows( | ||
| "Projection_8 0.00 root 3->Column#3", | ||
| "└─TableDual_9 0.00 root rows:0")) | ||
| tk.MustQuery("select a from (select 1+2 as a from t where d = 0) k where k.a = 5").Check(testkit.Rows()) | ||
| tk.MustQuery("explain select * from t where d != null;").Check(testkit.Rows( | ||
| "TableDual_6 0.00 root rows:0")) | ||
| tk.MustQuery("explain select * from t where d > null;").Check(testkit.Rows( | ||
| "TableDual_6 0.00 root rows:0")) | ||
| tk.MustQuery("explain select * from t where d >= null;").Check(testkit.Rows( | ||
| "TableDual_6 0.00 root rows:0")) | ||
| tk.MustQuery("explain select * from t where d < null;").Check(testkit.Rows( | ||
| "TableDual_6 0.00 root rows:0")) | ||
| tk.MustQuery("explain select * from t where d <= null;").Check(testkit.Rows( | ||
| "TableDual_6 0.00 root rows:0")) | ||
| tk.MustQuery("explain select * from t where d = null;").Check(testkit.Rows( | ||
| "TableDual_6 0.00 root rows:0")) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| // Copyright 2025 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, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package logicalop | ||
|
|
||
| import ( | ||
| "github.com/pingcap/tidb/pkg/expression" | ||
| "github.com/pingcap/tidb/pkg/parser/ast" | ||
| "github.com/pingcap/tidb/pkg/planner/core/base" | ||
| ) | ||
|
|
||
| // isConstFalse is used to check whether the expression is a constant false expression. | ||
| func isConstFalse(expr expression.Expression) bool { | ||
| if e, ok := expr.(*expression.ScalarFunction); ok { | ||
| switch e.FuncName.L { | ||
| case ast.LT, ast.LE, ast.GT, ast.GE, ast.EQ, ast.NE: | ||
| if constExpr, ok := e.GetArgs()[1].(*expression.Constant); ok && constExpr.Value.IsNull() && constExpr.DeferredExpr == nil { | ||
| return true | ||
| } | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // Conds2TableDual builds a LogicalTableDual if cond is constant false or null. | ||
| func Conds2TableDual(p base.LogicalPlan, conds []expression.Expression) base.LogicalPlan { | ||
| for _, cond := range conds { | ||
| if isConstFalse(cond) { | ||
| if expression.MaybeOverOptimized4PlanCache(p.SCtx().GetExprCtx(), conds) { | ||
| return nil | ||
| } | ||
| dual := LogicalTableDual{}.Init(p.SCtx(), p.QueryBlockOffset()) | ||
| dual.SetSchema(p.Schema()) | ||
| return dual | ||
| } | ||
| } | ||
| if len(conds) != 1 { | ||
| return nil | ||
| } | ||
|
|
||
| con, ok := conds[0].(*expression.Constant) | ||
| if !ok { | ||
| return nil | ||
| } | ||
| sc := p.SCtx().GetSessionVars().StmtCtx | ||
| if expression.MaybeOverOptimized4PlanCache(p.SCtx().GetExprCtx(), []expression.Expression{con}) { | ||
| return nil | ||
| } | ||
| if isTrue, err := con.Value.ToBool(sc.TypeCtxOrDefault()); (err == nil && isTrue == 0) || con.Value.IsNull() { | ||
| dual := LogicalTableDual{}.Init(p.SCtx(), p.QueryBlockOffset()) | ||
| dual.SetSchema(p.Schema()) | ||
| return dual | ||
| } | ||
| return nil | ||
| } |
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