sunjincheng created FLINK-6392:
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Summary: Change the alias of Window from optional to essential.
Key: FLINK-6392
URL: https://issues.apache.org/jira/browse/FLINK-6392
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Affects Versions: 1.3.0
Reporter: sunjincheng
Assignee: sunjincheng
Fix For: 1.3.0
Currently, The window clause use case looks like:
{code}
tab //Table('a,'b,'c)
.window( Slide over 10.milli every 5.milli as 'w)
.groupBy('w,'a,'b) // WindowGroupedTable
.select('a, 'b, 'c.sum, 'w.start, 'w.end)
{code}
As we see the alias of window is essential. But the current implementation of
the TableAPI does not have the constraint for the alias,So we must refactoring
the API definition using TYPE SYSTEM lead to constraint for the alias.
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