[jira] [Created] (FLINK-6462) Add requires over indicators for UDAF

[Shang Yuanchun (Jira)]

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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