Fabian Hueske created FLINK-9422: ------------------------------------ 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)