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From "Sohan Jain (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2219) Make "alter table drop partition" more efficient
Date Tue, 14 Jun 2011 18:40:48 GMT
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


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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