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https://issues.apache.org/jira/browse/HIVE-2219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13062167#comment-13062167
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Sohan Jain commented on HIVE-2219:
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Ok, please refer to HIVE-2275
> Make "alter table drop partition" more efficient
> ------------------------------------------------
>
> Key: HIVE-2219
> URL: https://issues.apache.org/jira/browse/HIVE-2219
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Sohan Jain
> Assignee: Sohan Jain
> Fix For: 0.8.0
>
> Attachments: HIVE-2219.1.patch, HIVE-2219.2.patch
>
>
> The current function dropTable() that handles dropping multiple partitions is
> somewhat inefficient. For each partition you want to drop, it loops through
> each partition in the table to see if the partition exists. This is an
> _O(mn)_ operation, where _m_ is the number of partitions to drop, and _n_ is
> the number of partitions in the table. The running time of this function can
> be improved, which is useful for tables with many partitions.
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