Hequn Cheng created FLINK-13087:
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Summary: Add group window Aggregate operator to Table API
Key: FLINK-13087
URL: https://issues.apache.org/jira/browse/FLINK-13087
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API
Reporter: Hequn Cheng
Assignee: Hequn Cheng
Add Group Window Aggregate operator to Table API as described in [Google
doc|https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr].
The usage:
{code:java}
val res = tab
.window(Tumble over 15.minute on 'rowtime as 'w)
.groupBy('w, 'a) // leave out groupBy-clause to define global aggregates
.agg(fun: AggregateFunction) // output has columns 'a, 'b, 'c
.select('a, 'c, 'w.start)
{code}
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