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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2870) Throw an error when a nonexistent partition is accessed in strict mode
Date Wed, 28 Mar 2012 01:17:22 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240090#comment-13240090
] 

Phabricator commented on HIVE-2870:
-----------------------------------

kevinwilfong has requested changes to the revision "HIVE-2870 [jira] Throw an error when a
nonexistent partition is accessed in strict mode".

  -1

  Sorry to have to go back after accepting, but I spoke with Namit Jain (another Hive committer)
about this diff.

  This diff has the potential to break queries which are otherwise working, such as a union
all where one of the partitions being unioned doesn't exist.  Particularly, if that partition
is only sometimes generated and the query is scripted.

  To avoid this, could you change the exception to a warning which is printed to the console.
 You could still use a variable which writes to the console in strict mode, and logs to info
in nonstrict mode, although it would be better to create a new Hive configuration variable
to do this, rather than reusing HIVEMAPREDMODE which is used far too much.

REVISION DETAIL
  https://reviews.facebook.net/D2319

BRANCH
  HIVE-2870-dev-branch

                
> Throw an error when a nonexistent partition is accessed in strict mode
> ----------------------------------------------------------------------
>
>                 Key: HIVE-2870
>                 URL: https://issues.apache.org/jira/browse/HIVE-2870
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Lucian Adrian Grijincu
>            Priority: Minor
>         Attachments: HIVE-2870.D2319.1.patch, HIVE-2870.D2319.2.patch, HIVE-2870.D2319.3.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> When a table does not exist and someone tries to read from it in a query, Hive throws
an error.
> But if a partition is directly accessed that does not exist, an error is not thrown.
This is inconsistent and also leads to a lot of confused users who get no output.
> This task is to cause Hive to throw an error when the partition pruner for a query eliminates
ALL existing partitions for some table when running in strict mode.

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