Yu Xu created CALCITE-7595:
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Summary: Support FILTER clause with window functions
Key: CALCITE-7595
URL: https://issues.apache.org/jira/browse/CALCITE-7595
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.42.0
Reporter: Yu Xu
Assignee: Yu Xu
Fix For: 1.43.0
Currently Calcite not support FILTER OVER syntax，but PostgreSQL support
it：[https://www.postgresql.org/docs/current/sql-expressions.html]
SQL
{code:java}
SELECT COUNT(*) FILTER (WHERE x > 5) OVER (PARTITION BY deptno) FROM t; {code}
error
{code:java}
-- ERROR: SqlValidatorException: OVER must be applied to aggregate function
{code}
Maybe we can improve the filter over support.
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