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https://issues.apache.org/jira/browse/IMPALA-14019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Carlin updated IMPALA-14019:
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Epic Link: IMPALA-15133
> Calcite Planner: Support Union for partition key scan
> -----------------------------------------------------
>
> Key: IMPALA-14019
> URL: https://issues.apache.org/jira/browse/IMPALA-14019
> Project: IMPALA
> Issue Type: Bug
> Reporter: Steve Carlin
> Priority: Major
>
> Creating this Jira because of this comment in this code review:
> https://gerrit.cloudera.org/#/c/22425/
> We'll have to think about unions. It obviously can't do things like the count
> star optimization, but some of the information is useful and can pass
> through. (But that doesn't impact this review.)
> For example: select count(*) from (select * from functional.alltypes union
> all select * from functional.alltypestiny);
> The regular planner doesn't change this into a partition key scan, but it
> could: select distinct year from (select year from functional.alltypes union
> all select year from functional.alltypessmall);
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