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Posted to dev@flink.apache.org by "Jark Wu (Jira)" <ji...@apache.org> on 2020/02/28 11:10:00 UTC

[jira] [Created] (FLINK-16332) Support un-ordered mode for async lookup join

Jark Wu created FLINK-16332:
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             Summary: Support un-ordered mode for async lookup join
                 Key: FLINK-16332
                 URL: https://issues.apache.org/jira/browse/FLINK-16332
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / API, Table SQL / Planner
            Reporter: Jark Wu


Currently, we only support "ordered" mode for async lookup join.  Because the ordering in streaming SQL is very important, the accumulate and retract messages shoudl be in ordered. If messages are out of order, the result will be wrong. 

The "un-ordered" mode can be enabled by a job configuration. But it will be a prefered option. Only if it doesn't affect the order of acc/retract messages (e.g. it is just an append-only stream), the "un-ordered" mode will be enabled. 



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