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https://issues.apache.org/jira/browse/HIVE-28427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-28427:
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Labels: pull-request-available (was: )
> HivePreFilteringRule gets applied multiple times
> ------------------------------------------------
>
> Key: HIVE-28427
> URL: https://issues.apache.org/jira/browse/HIVE-28427
> Project: Hive
> Issue Type: Bug
> Reporter: Soumyakanti Das
> Assignee: Soumyakanti Das
> Priority: Major
> Labels: pull-request-available
>
> In the {{matches}} method of {{{}HivePreFilteringRule{}}}, we check if a node
> has already been visited using the {{{}HiveRulesRegistry{}}}. This is done by
> using a {{{}SetMultimap<RelOptRule, RelNode>{}}}. Currently, we don't get the
> same hash value for equivalent RelNodes and because of this we visit similar
> nodes multiple times even when it is present in the registry. Sometimes we
> can also see infinite matching.
>
> Instead we can use a {{SetMultimap<RelOptRule, String>}} and store Strings.
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