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https://issues.apache.org/jira/browse/HIVE-20153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541927#comment-16541927
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Sahil Takiar commented on HIVE-20153:
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CC: [~aihuaxu]
> Count and Sum UDF consume more memory in Hive 2+
> ------------------------------------------------
>
> Key: HIVE-20153
> URL: https://issues.apache.org/jira/browse/HIVE-20153
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 2.3.2
> Reporter: Szehon Ho
> Priority: Major
> Attachments: Screen Shot 2018-07-12 at 6.41.28 PM.png
>
>
> While playing with Hive2, we noticed that queries with a lot of count() and
> sum() aggregations run out of memory on Hadoop side much faster than in
> Hive1. In many queries, we have to double the memory.
>
> Taking heap dump, we see one of the main culprit is the field 'uniqueObjects'
> in GeneraicUDAFSum and GenericUDAFCount, which was added to support Window
> functions.
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