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https://issues.apache.org/jira/browse/HIVE-21294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16778949#comment-16778949
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Gopal V commented on HIVE-21294:
--------------------------------
{code}
< Statistics: Num rows: 220 Data size: 41800 Basic
stats: COMPLETE Column stats: COMPLETE
---
> Statistics: Num rows: 150 Data size: 28500 Basic
> stats: COMPLETE Column stats: COMPLETE
{code}
diffs in murmur_hash_migration.q seems to be stats related
> Vectorization: 1-reducer Shuffle can skip the object hash functions
> -------------------------------------------------------------------
>
> Key: HIVE-21294
> URL: https://issues.apache.org/jira/browse/HIVE-21294
> Project: Hive
> Issue Type: Bug
> Components: Vectorization
> Reporter: Gopal V
> Assignee: Teddy Choi
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21294.2.patch, HIVE-21294.3.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> VectorReduceSinkObjectHashOperator can skip the object hashing entirely if
> the reducer count = 1.
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