ankitsultana opened a new issue, #15442:
URL: https://github.com/apache/pinot/issues/15442
This query generates an incorrect plan:
```
SET useMultistageEngine=true;
EXPLAIN PLAN FOR SELECT userUUID
FROM userAttributes
WHERE (deviceOS IN ('foo')
OR userUUID IN (
SELECT userUUID
FROM userGroups
WHERE groupUUID = 'group-1'
))
```
The plan contains two joins as you would expect, but the first join is a
key-less inner join where the right input is an aggregate with an empty
grouping set (i.e. a single value is returned from the right input which is
number of rows matching `groupUUID = 'group-1'`).
```
Execution Plan
LogicalProject(userUUID=[$1])
LogicalFilter(condition=[OR(=($0, _UTF-8'foo'), CAST(OR(AND(IS NOT
NULL($6), <>($2, 0)), AND(<($3, $2), null, <>($2, 0), IS NULL($6)))):BOOLEAN
NOT NULL)])
LogicalJoin(condition=[=($4, $5)], joinType=[left])
PinotLogicalExchange(distribution=[hash[4]])
LogicalProject(deviceOS=[$0], userUUID=[$1], $f0=[$2], $f1=[$3],
userUUID0=[$1])
LogicalJoin(condition=[true], joinType=[inner])
PinotLogicalExchange(distribution=[random])
LogicalProject(deviceOS=[$4], userUUID=[$6])
PinotLogicalTableScan(table=[[default, userattributes]])
PinotLogicalExchange(distribution=[broadcast])
LogicalProject($f0=[$0], $f00=[$0])
PinotLogicalAggregate(group=[{}], agg#0=[COUNT($0)],
aggType=[FINAL])
PinotLogicalExchange(distribution=[hash])
PinotLogicalAggregate(group=[{}], agg#0=[COUNT()],
aggType=[LEAF])
LogicalFilter(condition=[=($3, _UTF-8'group-1')])
PinotLogicalTableScan(table=[[default, usergroups]])
PinotLogicalExchange(distribution=[hash[0]])
PinotLogicalAggregate(group=[{0}], agg#0=[MIN($1)], aggType=[FINAL])
PinotLogicalExchange(distribution=[hash[0]])
PinotLogicalAggregate(group=[{0}], agg#0=[MIN($1)],
aggType=[LEAF])
LogicalProject(userUUID=[$4], $f1=[true])
LogicalFilter(condition=[=($3, _UTF-8'group-1')])
PinotLogicalTableScan(table=[[default, usergroups]])
```
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