Fabian Hueske created FLINK-9422:
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Summary: Dedicated operator for UNION on streaming tables with
time attributes
Key: FLINK-9422
URL: https://issues.apache.org/jira/browse/FLINK-9422
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Reporter: Fabian Hueske
We can implement a dedicated operator for a {{UNION}} operator on tables with
time attributes. Currently, {{UNION}} is translated into a {{UNION ALL}} and a
subsequent {{GROUP BY}} on all attributes without aggregation functions. The
state of the grouping operator is only clean up using state retention timers.
The dedicated operator would leverage the monotonicity property of the time
attribute and watermarks to automatically clean up its state.
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