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https://issues.apache.org/jira/browse/SPARK-43385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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yikaifei updated SPARK-43385:
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Description:
The Generator's statistics should be ratio times greater than the child nodes.
Generator is an expression that produces zero or more rows given a single input
row.
If `UserDefinedGenerator` and `HiveUDTF` were used, the output could be N times
that of the child node, resulting in a statistical error.
Because of incorrect statistics, Spark may select an incorrect execution plan.
For example, if `BroadcastHashJoinExec` is selected, the Job fails to broadcast
buildSide.
was:The Generator's statistics should be ratio times greater than the child
nodes.
> The Generator's statistics should be ratio times greater than the child nodes
> -----------------------------------------------------------------------------
>
> Key: SPARK-43385
> URL: https://issues.apache.org/jira/browse/SPARK-43385
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: yikaifei
> Priority: Minor
> Fix For: 3.5.0
>
>
> The Generator's statistics should be ratio times greater than the child nodes.
> Generator is an expression that produces zero or more rows given a single
> input row.
> If `UserDefinedGenerator` and `HiveUDTF` were used, the output could be N
> times that of the child node, resulting in a statistical error.
> Because of incorrect statistics, Spark may select an incorrect execution
> plan. For example, if `BroadcastHashJoinExec` is selected, the Job fails to
> broadcast buildSide.
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