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From "Phabricator (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-2780) Implement more restrictive table sampler
Date Tue, 07 Feb 2012 07:49:03 GMT

     [ https://issues.apache.org/jira/browse/HIVE-2780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phabricator updated HIVE-2780:
------------------------------

    Attachment: HIVE-2780.D1623.1.patch

navis requested code review of "HIVE-2780 [jira] Implement more restrictive table sampler".
Reviewers: JIRA

  DPAL-722 Implement head sampler for each blocks

  Current table sampling scans whole block, making more rows included than expected especially
for small tables.

TEST PLAN
  EMPTY

REVISION DETAIL
  https://reviews.facebook.net/D1623

AFFECTED FILES
  ql/src/java/org/apache/hadoop/hive/ql/io/CombineHiveInputFormat.java
  ql/src/java/org/apache/hadoop/hive/ql/io/PercentSampler.java
  ql/src/test/queries/clientpositive/tablesamples.q
  ql/src/test/results/clientpositive/tablesamples.q.out

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> Implement more restrictive table sampler
> ----------------------------------------
>
>                 Key: HIVE-2780
>                 URL: https://issues.apache.org/jira/browse/HIVE-2780
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Navis
>            Priority: Trivial
>         Attachments: HIVE-2780.D1623.1.patch
>
>
> Current table sampling scans whole block, making more rows included than expected especially
for small tables.

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