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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