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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