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https://issues.apache.org/jira/browse/HIVE-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16307607#comment-16307607
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Lefty Leverenz commented on HIVE-3958:
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Doc note: This adds the syntax ANALYZE TABLE ... COMPUTE STATISTICS
PARTIALSCAN, which needs to be documented in the wiki. The reserved keyword
PARTIALSCAN is already documented.
* [Statistics -- ExistingTables–ANALYZE |
https://cwiki.apache.org/confluence/display/Hive/StatsDev#StatsDev-ExistingTables–ANALYZE]
* [DDL -- Reserved Keywords |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-ReservedKeywords]
HIVE-17652 removes this syntax in release 3.0.0.
Added a TODOC11 label.
> support partial scan for analyze command - RCFile
> -------------------------------------------------
>
> Key: HIVE-3958
> URL: https://issues.apache.org/jira/browse/HIVE-3958
> Project: Hive
> Issue Type: Improvement
> Reporter: Gang Tim Liu
> Assignee: Gang Tim Liu
> Labels: TODOC11
> Fix For: 0.11.0
>
> Attachments: HIVE-3958.patch.1, HIVE-3958.patch.2, HIVE-3958.patch.3,
> HIVE-3958.patch.4, HIVE-3958.patch.5, HIVE-3958.patch.6
>
>
> analyze commands allows us to collect statistics on existing
> tables/partitions. It works great but might be slow since it scans all files.
> There are 2 ways to speed it up:
> 1. collect stats without file scan. It may not collect all stats but good and
> fast enough for use case. HIVE-3917 addresses it
> 2. collect stats via partial file scan. It doesn't scan all content of files
> but part of it to get file metadata. some examples are
> https://cwiki.apache.org/Hive/rcfilecat.html for RCFile, ORC ( HIVE-3874 )
> and HFile of Hbase (Edit: That link should be
> https://cwiki.apache.org/confluence/display/Hive/RCFileCat.)
> This jira is targeted to address the #2. More specifically RCFile format.
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