Steve Carlin created HIVE-25670:
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Summary: 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
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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