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planner: fix inconsistent schema between UnionAll and child operator #30231

Merged
merged 11 commits into from
Dec 1, 2021
Merged

planner: fix inconsistent schema between UnionAll and child operator #30231

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195186d
fix
time-and-fate Nov 29, 2021
63ada95
add test
time-and-fate Nov 29, 2021
807bf1e
fix test
time-and-fate Nov 29, 2021
39eaa42
fix test
time-and-fate Nov 29, 2021
476d4b8
fix fmt
time-and-fate Nov 29, 2021
70144e7
switch to another method
time-and-fate Nov 30, 2021
39c7182
Merge branch 'master' into issue29705
time-and-fate Nov 30, 2021
b83fad7
make proj.schema and proj.exprs share the same slice of columns
time-and-fate Dec 1, 2021
139229c
Merge remote-tracking branch 'origin/issue29705' into issue29705
time-and-fate Dec 1, 2021
f2a35a7
Merge remote-tracking branch 'upstream/master' into issue29705
time-and-fate Dec 1, 2021
8cc4964
Merge branch 'master' into issue29705
ti-chi-bot Dec 1, 2021
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22 changes: 22 additions & 0 deletions planner/core/integration_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4713,6 +4713,12 @@ func (s *testIntegrationSerialSuite) TestPushDownGroupConcatToTiFlash(c *C) {

func (s *testIntegrationSuite) TestIssue27797(c *C) {
tk := testkit.NewTestKit(c, s.store)
origin := tk.MustQuery("SELECT @@session.tidb_partition_prune_mode")
originStr := origin.Rows()[0][0].(string)
defer func() {
tk.MustExec("set @@session.tidb_partition_prune_mode = '" + originStr + "'")
}()
tk.MustExec("set @@session.tidb_partition_prune_mode = 'static'")
tk.MustExec("use test")
tk.MustExec("drop table if exists t27797")
tk.MustExec("create table t27797(a int, b int, c int, d int) " +
Expand Down Expand Up @@ -4897,3 +4903,19 @@ func (s *testIntegrationSuite) TestIssue30094(c *C) {
" └─TableFullScan 10000.00 cop[tikv] table:t30094 keep order:false, stats:pseudo",
))
}

func (s *testIntegrationSuite) TestIssue29705(c *C) {
tk := testkit.NewTestKit(c, s.store)
origin := tk.MustQuery("SELECT @@session.tidb_partition_prune_mode")
originStr := origin.Rows()[0][0].(string)
defer func() {
tk.MustExec("set @@session.tidb_partition_prune_mode = '" + originStr + "'")
}()
tk.MustExec("set @@session.tidb_partition_prune_mode = 'static'")
tk.MustExec("use test")
tk.MustExec("drop table if exists t;")
tk.MustExec("create table t(id int) partition by hash(id) partitions 4;")
tk.MustExec("insert into t values(1);")
result := tk.MustQuery("SELECT COUNT(1) FROM ( SELECT COUNT(1) FROM t b GROUP BY id) a;")
result.Check(testkit.Rows("1"))
}
17 changes: 17 additions & 0 deletions planner/core/rule_column_pruning.go
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Expand Up @@ -241,6 +241,23 @@ func (p *LogicalUnionAll) PruneColumns(parentUsedCols []*expression.Column) erro
p.schema.Columns = append(p.schema.Columns[:i], p.schema.Columns[i+1:]...)
}
}
// It's possible that the child operator adds extra columns to the schema.
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// Currently, (*LogicalAggregation).PruneColumns() might do this.
// But we don't need such columns, so we add an extra Projection to prune this column when this happened.
for i, child := range p.Children() {
if p.schema.Len() < child.Schema().Len() {
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p.schema is adjusted with child[0] . Will it happens that p.schema.Len() > child[1].Schema().Len() ?

schema := p.schema.Clone()
exprs := make([]expression.Expression, len(p.schema.Columns))
for j, col := range schema.Columns {
exprs[j] = col
}
proj := LogicalProjection{Exprs: exprs, AvoidColumnEvaluator: true}.Init(p.ctx, p.blockOffset)
proj.SetSchema(schema)

proj.SetChildren(child)
p.children[i] = proj
}
}
}
return nil
}
Expand Down