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https://issues.apache.org/jira/browse/CALCITE-4636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rui Wang resolved CALCITE-4636.
-------------------------------
Fix Version/s: 1.28.0
Resolution: Fixed
> Wrong RelCollation if a field in Group by appears in Order by of Within Group
> clause
> ------------------------------------------------------------------------------------
>
> Key: CALCITE-4636
> URL: https://issues.apache.org/jira/browse/CALCITE-4636
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Rafay A
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.28.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> If we run this query:
> {code:java}
> select regionkey, collect(regionkey)
> within group (order by regionkey)
> from (SELECT * FROM (VALUES('blah','blah','blah',1,1)) as
> TBL(f1,f2,f3,nationkey,regionkey))
> group by regionkey
> {code}
>
> We see that we are ordering by the same field as the group by field
> (regionkey). Now the query may be non-sensicle as there is no point of
> collecting the same field with in the same group, but syntactically its a
> valid SQL and should produce correct plan, but it generates this plan instead:
> {code:java}
> LogicalAggregate(group=[{0}], EXPR$1=[COLLECT($0) WITHIN GROUP ([1])])
> LogicalProject(REGIONKEY=[$4], F1=[$0])
> LogicalProject(F1=[$0], F2=[$1], F3=[$2], NATIONKEY=[$3], REGIONKEY=[$4])
> LogicalValues(tuples=[[{ 'blah', 'blah', 'blah', 1, 1 }]])
> {code}
>
> If we run the following *good* query, it generates correct plan:
>
> {code:java}
> select nationkey, collect(regionkey)
> within group (order by regionkey)
> from (SELECT * FROM (VALUES('blah','blah','blah',1,1)) as
> TBL(f1,f2,f3,nationkey,regionkey))
> group by regionkey{code}
>
> Generated plan:
> {noformat}
> LogicalAggregate(group=[{0}], EXPR$1=[COLLECT($1) WITHIN GROUP ([1])])
> LogicalProject(NATIONKEY=[$3], REGIONKEY=[$4])
> LogicalProject(F1=[$0], F2=[$1], F3=[$2], NATIONKEY=[$3], REGIONKEY=[$4])
> LogicalValues(tuples=[[{ 'blah', 'blah', 'blah', 1, 1 }]]){noformat}
>
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