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https://issues.apache.org/jira/browse/HIVE-15269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16335422#comment-16335422
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Ke Jia commented on HIVE-15269:
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[~djaiswal] thanks for you reply.
> The 2nd GBY–>RS is executed in a Reducer vertex where it aggregates all the
>min-max and bloom filters.
Here, when aggregating the min-max and bloom filters, whether it calculates the
final min-max and bloom filters or it only combine all the min-max and bloom
filters? If yes, why calculate the final min-max and bloom filters again in [|
https://github.com/apache/hive/blob/3bbf35f8ecfecc6690832ee43f4e2d2bcdad7660/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/DynamicValueRegistryTez.java#L119]
And I wonder what is the key in two "GBY" operation, because it not show the
keys in the explain plan. Thanks for your help!
> 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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