sunjincheng created FLINK-6462:
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Summary: Add requires over indicators for UDAF
Key: FLINK-6462
URL: https://issues.apache.org/jira/browse/FLINK-6462
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Reporter: sunjincheng
Assignee: sunjincheng
The window function in the standard database only supports the "over" window,
such as `LAG`,` LEAD`, `FIRST_VALUE`,` LAST_VALUE`. These window functions do
not apply to `Slide`,` Tumble`, `Session` window. So when the user-defined AGG
need to be clearly defined. In calcite `SqlAggFunction` will using
`requiresOver` to distinguish.
In this JIRA. will deal with this feature.
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