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https://issues.apache.org/jira/browse/HIVE-17239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Janaki Lahorani reassigned HIVE-17239:
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Assignee: Janaki Lahorani
> HoS doesn't trigger mapjoins against subquery with union all
> ------------------------------------------------------------
>
> Key: HIVE-17239
> URL: https://issues.apache.org/jira/browse/HIVE-17239
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Sahil Takiar
> Assignee: Janaki Lahorani
>
> HoS doesn't trigger map-joins for the following query:
> {code}
> EXPLAIN SELECT * FROM (SELECT part_col FROM partitioned_table1 UNION ALL
> SELECT
> part_col FROM partitioned_table2) q1 JOIN regular_table1 JOIN regular_table2
> WHERE q1.part_col = regular_table1.col1 AND q1.part_col = regular_table2.col1;
> {code}
> Hive-on-Tez does.
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