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

["Yunhong Zheng (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-27591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17614858#comment-17614858 ] 

Yunhong Zheng commented on FLINK-27591:
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Hi, [~godfreyhe] , I would like to get this ticket. Could you assign this to me, Thanks a lot!

> 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
>            Priority: Major
>             Fix For: 1.17.0
>
>
> 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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