Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3641
@fhueske - you can check also the definition from the Calcite website
https://calcite.apache.org/docs/stream.html
Standard SQL features so-called âanalytic functionsâ that can be used
in the SELECT clause. Unlike GROUP BY, these do not collapse records. For each
record that goes in, one record comes out. But the aggregate function is based
on a window of many rows.
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