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Posted to dev@hive.apache.org by "Navis (Created) (JIRA)" <ji...@apache.org> on 2012/02/07 08:47:00 UTC
[jira] [Created] (HIVE-2780) Implement more restrictive table
sampler
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
Current table sampling scans whole block, making more rows included than expected especially for small tables.
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[jira] [Assigned] (HIVE-2780) Implement more restrictive table
sampler
Posted by "Navis (Assigned) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-2780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Navis reassigned HIVE-2780:
---------------------------
Assignee: Navis
> Implement more restrictive table sampler
> ----------------------------------------
>
> Key: HIVE-2780
> URL: https://issues.apache.org/jira/browse/HIVE-2780
> Project: Hive
> Issue Type: Improvement
> Reporter: Navis
> Assignee: 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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[jira] [Updated] (HIVE-2780) Implement more restrictive table
sampler
Posted by "Phabricator (Updated) (JIRA)" <ji...@apache.org>.
[ 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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