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https://issues.apache.org/jira/browse/HIVE-20954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694601#comment-16694601
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ASF GitHub Bot commented on HIVE-20954:
---------------------------------------
GitHub user pudidic opened a pull request:
https://github.com/apache/hive/pull/492
HIVE-20954: Vector RS operator is not using uniform hash function for…
… TPC-DS query 95 (Teddy Choi)
Change-Id: Ia23b5ddefc2b35cda9ed7d817bdbd767ec7f7671
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/pudidic/hive HIVE-20954
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/hive/pull/492.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #492
----
commit 17dd49c160eeea7b5a511e9a6801e2e9b298ac1a
Author: Teddy Choi <tchoi@...>
Date: 2018-11-21T11:55:04Z
HIVE-20954: Vector RS operator is not using uniform hash function for
TPC-DS query 95 (Teddy Choi)
Change-Id: Ia23b5ddefc2b35cda9ed7d817bdbd767ec7f7671
----
> Vector RS operator is not using uniform hash function for TPC-DS query 95
> -------------------------------------------------------------------------
>
> Key: HIVE-20954
> URL: https://issues.apache.org/jira/browse/HIVE-20954
> Project: Hive
> Issue Type: Improvement
> Reporter: Teddy Choi
> Assignee: Teddy Choi
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-20954.1.patch
>
>
> Distribution of rows is skewed in DHJ causing slowdown.
> Same RS outputs, but the two branches use VectorReduceSinkObjectHashOperator
> and VectorReduceSinkLongOperator.
> {code}
> | Select Operator |
> | expressions: ws_warehouse_sk (type: bigint),
> ws_order_number (type: bigint) |
> | outputColumnNames: _col0, _col1 |
> | Select Vectorization: |
> | className: VectorSelectOperator |
> | native: true |
> | projectedOutputColumnNums: [14, 16] |
> | Statistics: Num rows: 7199963324 Data size:
> 115185006696 Basic stats: COMPLETE Column stats: COMPLETE |
> | Reduce Output Operator |
> | key expressions: _col1 (type: bigint) |
> | sort order: + |
> | Map-reduce partition columns: _col1 (type: bigint) |
> | Reduce Sink Vectorization: |
> | className: VectorReduceSinkObjectHashOperator |
> | keyColumnNums: [16] |
> | native: true |
> | nativeConditionsMet:
> hive.vectorized.execution.reducesink.new.enabled IS true,
> hive.execution.engine tez IN [tez, spark] IS true, No PTF TopN IS true, No
> DISTINCT columns IS true, BinarySortableSerDe for keys IS true,
> LazyBinarySerDe for values IS true |
> | partitionColumnNums: [16] |
> | valueColumnNums: [14] |
> +----------------------------------------------------+
> | Explain |
> +----------------------------------------------------+
> | Statistics: Num rows: 7199963324 Data size:
> 115185006696 Basic stats: COMPLETE Column stats: COMPLETE |
> | value expressions: _col0 (type: bigint) |
> | Reduce Output Operator |
> | key expressions: _col1 (type: bigint) |
> | sort order: + |
> | Map-reduce partition columns: _col1 (type: bigint) |
> | Reduce Sink Vectorization: |
> | className: VectorReduceSinkLongOperator |
> | keyColumnNums: [16] |
> | native: true |
> | nativeConditionsMet:
> hive.vectorized.execution.reducesink.new.enabled IS true,
> hive.execution.engine tez IN [tez, spark] IS true, No PTF TopN IS true, No
> DISTINCT columns IS true, BinarySortableSerDe for keys IS true,
> LazyBinarySerDe for values IS true |
> | valueColumnNums: [14] |
> | Statistics: Num rows: 7199963324 Data size:
> 115185006696 Basic stats: COMPLETE Column stats: COMPLETE |
> | value expressions: _col0 (type: bigint) |
> | Execution mode: vectorized, llap |
> {code}
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