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[jira] [Created] (CALCITE-2648) Implementation of EnumerableWindow does not preserve input collation


Hongze Zhang created CALCITE-2648:
-------------------------------------

             Summary: Implementation of EnumerableWindow does not preserve input collation
                 Key: CALCITE-2648
                 URL: https://issues.apache.org/jira/browse/CALCITE-2648
             Project: Calcite
          Issue Type: Bug
            Reporter: Hongze Zhang
            Assignee: Julian Hyde


Here is a case:
{code:sql}
select x, COUNT(*) OVER (PARTITION BY x) from (values (20), (35)) as t(x) ORDER BY x
{code}
Final plan:
{code:java}
EnumerableWindow(window#0=[window(partition {0} order by [] range between UNBOUNDED PRECEDING and UNBOUNDED FOLLOWING aggs [COUNT()])])
  EnumerableValues(tuples=[[{ 20 }, { 35 }]])
{code}
Output rows:
{code:java}
X  |EXPR$1 |
---|-------|
35 |1      |
20 |1      |
{code}
EnumerableWindow is supposed to preserve input collations, as a result EnumerableSort is ignored. However the implementation of EnumerableWindow generates non-ordered output (when PARTITION BY clause is used).



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