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Posted to dev@flink.apache.org by "godfrey he (Jira)" <ji...@apache.org> on 2022/05/12 10:34:00 UTC

[jira] [Created] (FLINK-27591) Improve the plan for batch queries when statistics is unavailable

godfrey he created FLINK-27591:
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             Summary: Improve the plan for batch queries when statistics is unavailable 
                 Key: FLINK-27591
                 URL: https://issues.apache.org/jira/browse/FLINK-27591
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / Planner
            Reporter: godfrey he


This jira is an umbrella issue, which aims to improve the plan for batch queries when statistics is unavailable.
Currently, when statistics is unavailable, the planner will give default cost, which may lead to the planner choosing bad plan, such as: wrong broadcast join plan will cause a lot of network shuffle and OOM.

We can detect whether the source tables have statistics. if not, join order, hash join can be disabled.




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