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https://issues.apache.org/jira/browse/HIVE-15269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deepak Jaiswal updated HIVE-15269:
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Attachment: HIVE-15269.11.patch
Semijoin Reduction feature to optimize joins.
Updated result files with diff in explain plans.
> Dynamic Min-Max runtime-filtering for Tez
> -----------------------------------------
>
> Key: HIVE-15269
> URL: https://issues.apache.org/jira/browse/HIVE-15269
> Project: Hive
> Issue Type: New Feature
> Reporter: Jason Dere
> Assignee: Deepak Jaiswal
> Attachments: HIVE-15269.1.patch, HIVE-15269.10.patch,
> HIVE-15269.11.patch, HIVE-15269.2.patch, HIVE-15269.3.patch,
> HIVE-15269.4.patch, HIVE-15269.5.patch, HIVE-15269.6.patch,
> HIVE-15269.7.patch, HIVE-15269.8.patch, HIVE-15269.9.patch
>
>
> If a dimension table and fact table are joined:
> {noformat}
> select *
> from store join store_sales on (store.id = store_sales.store_id)
> where store.s_store_name = 'My Store'
> {noformat}
> One optimization that can be done is to get the min/max store id values that
> come out of the scan/filter of the store table, and send this min/max value
> (via Tez edge) to the task which is scanning the store_sales table.
> We can add a BETWEEN(min, max) predicate to the store_sales TableScan, where
> this predicate can be pushed down to the storage handler (for example for ORC
> formats). Pushing a min/max predicate to the ORC reader would allow us to
> avoid having to entire whole row groups during the table scan.
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