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planner/core: fix not null flag for using and natural join (#13735) #13739

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merged 1 commit into from
Nov 26, 2019
Merged

planner/core: fix not null flag for using and natural join (#13735) #13739

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4 changes: 3 additions & 1 deletion planner/core/integration_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,7 @@ func (s *testIntegrationSuite) runTestsWithTestData(caseName string, tk *testkit
}
}

func (s *testIntegrationSuite) TestApplyNotNullFlag(c *C) {
func (s *testIntegrationSuite) TestJoinNotNullFlag(c *C) {
store, dom, err := newStoreWithBootstrap()
c.Assert(err, IsNil)
tk := testkit.NewTestKit(c, store)
Expand All @@ -121,6 +121,8 @@ func (s *testIntegrationSuite) TestApplyNotNullFlag(c *C) {
tk.MustExec("insert into t2 values (1)")

tk.MustQuery("select IFNULL((select t1.x from t1 where t1.x = t2.x), 'xxx') as col1 from t2").Check(testkit.Rows("xxx"))
tk.MustQuery("select ifnull(t1.x, 'xxx') from t2 left join t1 using(x)").Check(testkit.Rows("xxx"))
tk.MustQuery("select ifnull(t1.x, 'xxx') from t2 natural left join t1").Check(testkit.Rows("xxx"))
}

func (s *testIntegrationSuite) TestSimplifyOuterJoinWithCast(c *C) {
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13 changes: 9 additions & 4 deletions planner/core/logical_plan_builder.go
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Original file line number Diff line number Diff line change
Expand Up @@ -480,7 +480,7 @@ func (b *PlanBuilder) buildUsingClause(p *LogicalJoin, leftPlan, rightPlan Logic
for _, col := range join.Using {
filter[col.Name.L] = true
}
return b.coalesceCommonColumns(p, leftPlan, rightPlan, join.Tp == ast.RightJoin, filter)
return b.coalesceCommonColumns(p, leftPlan, rightPlan, join.Tp, filter)
}

// buildNaturalJoin builds natural join output schema. It finds out all the common columns
Expand All @@ -490,15 +490,20 @@ func (b *PlanBuilder) buildUsingClause(p *LogicalJoin, leftPlan, rightPlan Logic
// Every column in the first (left) table that is not a common column
// Every column in the second (right) table that is not a common column
func (b *PlanBuilder) buildNaturalJoin(p *LogicalJoin, leftPlan, rightPlan LogicalPlan, join *ast.Join) error {
return b.coalesceCommonColumns(p, leftPlan, rightPlan, join.Tp == ast.RightJoin, nil)
return b.coalesceCommonColumns(p, leftPlan, rightPlan, join.Tp, nil)
}

// coalesceCommonColumns is used by buildUsingClause and buildNaturalJoin. The filter is used by buildUsingClause.
func (b *PlanBuilder) coalesceCommonColumns(p *LogicalJoin, leftPlan, rightPlan LogicalPlan, rightJoin bool, filter map[string]bool) error {
func (b *PlanBuilder) coalesceCommonColumns(p *LogicalJoin, leftPlan, rightPlan LogicalPlan, joinTp ast.JoinType, filter map[string]bool) error {
lsc := leftPlan.Schema().Clone()
rsc := rightPlan.Schema().Clone()
if joinTp == ast.LeftJoin {
resetNotNullFlag(rsc, 0, rsc.Len())
} else if joinTp == ast.RightJoin {
resetNotNullFlag(lsc, 0, lsc.Len())
}
lColumns, rColumns := lsc.Columns, rsc.Columns
if rightJoin {
if joinTp == ast.RightJoin {
lColumns, rColumns = rsc.Columns, lsc.Columns
}

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