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https://issues.apache.org/jira/browse/HIVE-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923320#action_12923320
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Namit Jain commented on HIVE-1737:
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+1
> Two Bugs for Estimating Row Sizes in GroupByOperator
> ----------------------------------------------------
>
> Key: HIVE-1737
> URL: https://issues.apache.org/jira/browse/HIVE-1737
> Project: Hive
> Issue Type: Bug
> Reporter: Siying Dong
> Assignee: Siying Dong
> Attachments: HIVE-1737.1.patch
>
>
> Two bugs:
> 1. if UDAF uses string type, Group-by will break as it tries to insert an
> ArrayList<Object> to a HashMap<KeyWrapper, AggregationBuffer[]>.
> 2. The code to sample size of keys only handles String type and Text type,
> while in most cases, they are org.apache.hadoop.hive.serde2.lazy.LazyString,
> so that 0 is always used.
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