godfrey he created FLINK-12170:
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Summary: Add support for generating optimized logical plan for
Over aggregate
Key: FLINK-12170
URL: https://issues.apache.org/jira/browse/FLINK-12170
Project: Flink
Issue Type: New Feature
Components: Table SQL / Planner
Reporter: godfrey he
Assignee: godfrey he
This issue aims to generate optimized plan for Over aggregate queries, e.g.
{code:sql}
SELECT a, b, c, RANK() OVER (PARTITION BY b ORDER BY c) FROM MyTable
{code}
currently, Stream requires all over aggregate functions must be computed on the
same window, e.g.
{code:sql}
SELECT c,
COUNT(a) OVER (PARTITION BY c ORDER BY proctime RANGE UNBOUNDED PRECEDING),
SUM(a) OVER (PARTITION BY b ORDER BY proctime RANGE UNBOUNDED PRECEDING)
from MyTable
{code}
the above sql is not supported because the partition keys is different.
Batch does not have such limitation.
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