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planner: fix bug when pruning columns for TableDual (#11054) #11247

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merged 4 commits into from
Jul 15, 2019
Merged

planner: fix bug when pruning columns for TableDual (#11054) #11247

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5210b6e
planner: fix bug when pruning columns for TableDual (#11054)
winoros Jul 11, 2019
934cf37
Merge branch 'release-3.0' into pick1
eurekaka Jul 15, 2019
8086642
Merge branch 'release-3.0' into pick1
zz-jason Jul 15, 2019
5966308
Merge branch 'release-3.0' into pick1
zz-jason Jul 15, 2019
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3 changes: 3 additions & 0 deletions executor/executor_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1853,6 +1853,9 @@ func (s *testSuite) TestTableDual(c *C) {
result.Check(testkit.Rows("1"))
result = tk.MustQuery("Select 1 from dual where 1")
result.Check(testkit.Rows("1"))

tk.MustExec("create table t(a int primary key)")
tk.MustQuery("select t1.* from t t1, t t2 where t1.a=t2.a and 1=0").Check(testkit.Rows())
}

func (s *testSuite) TestTableScan(c *C) {
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9 changes: 8 additions & 1 deletion planner/core/rule_column_pruning.go
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Original file line number Diff line number Diff line change
Expand Up @@ -262,8 +262,15 @@ func (p *LogicalTableDual) PruneColumns(parentUsedCols []*expression.Column) err
}
}
for k, cols := range p.schema.TblID2Handle {
if p.schema.ColumnIndex(cols[0]) == -1 {
for i := len(cols) - 1; i >= 0; i-- {
if p.schema.ColumnIndex(cols[i]) == -1 {
cols = append(cols[:i], cols[i+1:]...)
}
}
if len(cols) == 0 {
delete(p.schema.TblID2Handle, k)
} else {
p.schema.TblID2Handle[k] = cols
}
}
return nil
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