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https://issues.apache.org/jira/browse/IMPALA-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-9924:
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Labels: tpcds (was: )
> Add support for single IN in disjunction
> ----------------------------------------
>
> Key: IMPALA-9924
> URL: https://issues.apache.org/jira/browse/IMPALA-9924
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Labels: tpcds
>
> A simple case of IMPALA-5226 with a simple rewrite is an IN predicate. We can
> directly rewrite it into a left outer join
> {noformat}
> WHERE <condition> OR (x IN (select y ...))
> {noformat}
> Can be transformed into
> {noformat}
> LEFT OUTER JOIN (select distinct y ...) v on x = v.y
> ...
> WHERE <condition> OR v.y IS NOT NULL
> {noformat}
> This pattern appears in TPC-DS query 45.
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