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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-5381) OOM when using many lead/lag funtions against large partition
Date Fri, 27 Sep 2013 08:09:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phabricator updated HIVE-5381:
------------------------------

    Attachment: D13161.1.patch

navis requested code review of "HIVE-5381 [jira] OOM when using many lead/lag funtions against
large partition".

Reviewers: JIRA

HIVE-5381 OOM when using many lead/lag funtions against large partition

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.

TEST PLAN
  EMPTY

REVISION DETAIL
  https://reviews.facebook.net/D13161

AFFECTED FILES
  ql/src/java/org/apache/hadoop/hive/ql/exec/LLRowResolver.java
  ql/src/java/org/apache/hadoop/hive/ql/exec/PTFPartition.java
  ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/WindowingTableFunction.java

MANAGE HERALD RULES
  https://reviews.facebook.net/herald/view/differential/

WHY DID I GET THIS EMAIL?
  https://reviews.facebook.net/herald/transcript/38499/

To: JIRA, navis

                
> 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
>         Attachments: D13161.1.patch
>
>
> 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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