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https://issues.apache.org/jira/browse/HIVE-15269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334049#comment-16334049
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Deepak Jaiswal commented on HIVE-15269:
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[~Jk_Self] thanks fo asking. Yes it is necessary. The 1st set part of the
branch SEL->GBY->RS are executed in same vertex. The 2nd GBY–>RS is executed in
a Reducer vertex where it aggregates all the min-max and bloom filters.
Please let me know if you have any more questions.
> Dynamic Min-Max/BloomFilter runtime-filtering for Tez
> -----------------------------------------------------
>
> Key: HIVE-15269
> URL: https://issues.apache.org/jira/browse/HIVE-15269
> Project: Hive
> Issue Type: New Feature
> Components: Tez
> Reporter: Jason Dere
> Assignee: Deepak Jaiswal
> Priority: Major
> Labels: TODOC2.2.0
> Fix For: 2.2.0
>
> Attachments: HIVE-15269.1.patch, HIVE-15269.10.patch,
> HIVE-15269.11.patch, HIVE-15269.12.patch, HIVE-15269.13.patch,
> HIVE-15269.14.patch, HIVE-15269.15.patch, HIVE-15269.16.patch,
> HIVE-15269.17.patch, HIVE-15269.18.patch, HIVE-15269.19.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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