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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-4324) ORC Turn off dictionary encoding when number of distinct keys is greater than threshold
Date Wed, 07 Aug 2013 18:18:48 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phabricator updated HIVE-4324:
------------------------------

    Attachment: HIVE-4324.D12045.1.patch

omalley requested code review of "HIVE-4324 [jira] ORC Turn off dictionary encoding when number
of distinct keys is greater than threshold".

Reviewers: JIRA

forward port of kevin's patch

Add a configurable threshold so that if the number of distinct values in a string column is
greater than that fraction of non-null values, dictionary encoding is turned off.

TEST PLAN
  EMPTY

REVISION DETAIL
  https://reviews.facebook.net/D12045

AFFECTED FILES
  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
  conf/hive-default.xml.template
  ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcFile.java
  ql/src/java/org/apache/hadoop/hive/ql/io/orc/OutStream.java
  ql/src/java/org/apache/hadoop/hive/ql/io/orc/RecordReaderImpl.java
  ql/src/java/org/apache/hadoop/hive/ql/io/orc/StringRedBlackTree.java
  ql/src/java/org/apache/hadoop/hive/ql/io/orc/WriterImpl.java
  ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestFileDump.java
  ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestOrcFile.java
  ql/src/test/queries/clientpositive/orc_dictionary_threshold.q
  ql/src/test/resources/orc-file-dump-dictionary-threshold.out
  ql/src/test/results/clientpositive/orc_dictionary_threshold.q.out

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

WHY DID I GET THIS EMAIL?
  https://reviews.facebook.net/herald/transcript/28797/

To: JIRA, omalley

                
> ORC Turn off dictionary encoding when number of distinct keys is greater than threshold
> ---------------------------------------------------------------------------------------
>
>                 Key: HIVE-4324
>                 URL: https://issues.apache.org/jira/browse/HIVE-4324
>             Project: Hive
>          Issue Type: Sub-task
>          Components: File Formats
>    Affects Versions: 0.11.0
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-4324.1.patch.txt, HIVE-4324.D12045.1.patch
>
>
> Add a configurable threshold so that if the number of distinct values in a string column
is greater than that fraction of non-null values, dictionary encoding is turned off.

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