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https://issues.apache.org/jira/browse/HIVE-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Navis updated HIVE-5381:
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Status: Patch Available (was: Open)
Initial patch.
can be optimized further and row_number() also can be included in this category.
> OOM when using many lead/lag funtions against large partition
> -------------------------------------------------------------
>
> Key: HIVE-5381
> URL: https://issues.apache.org/jira/browse/HIVE-5381
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Navis
> Assignee: Navis
> Priority: Minor
>
> Currently, columns containing window function are evaluated for all rows in a
> partition, which possibly make OOM if the partition is big (400MB in my
> case). For lead/lag functions, the value can be evaluated per row.
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