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https://issues.apache.org/jira/browse/HIVE-25670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich resolved HIVE-25670.
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Fix Version/s: 4.0.0
Resolution: Fixed
merged into master. Thank you [~scarlin] !
> Avoid getTable() calls for foreign key tables not used in a query
> -----------------------------------------------------------------
>
> Key: HIVE-25670
> URL: https://issues.apache.org/jira/browse/HIVE-25670
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Reporter: Steve Carlin
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> In RelOptHiveTable, we generate the referential constraints for the table. In
> this process, we make a metastore call to fetch these tables. This is used
> later on for potential gain on joins done on the key.
> However, there is no need to fetch these constraints if the table is not used
> in the query. If we can get this information up front, we can save a bit on
> compilation time.
>
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