[jira] [Created] (CALCITE-4636) Wrong RelCollation if Group by field appears in Order by clause

["Rafay A (Jira)" <ji...@apache.org>]

Rafay A created CALCITE-4636:
--------------------------------

             Summary: Wrong RelCollation if Group by field appears in Order by clause
                 Key: CALCITE-4636
                 URL: https://issues.apache.org/jira/browse/CALCITE-4636
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Rafay A


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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