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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-5119) MapJoin & Partition Pruning (MapJoin can take advantage of materialized data to prune partitions of big table)
Date Mon, 19 Aug 2013 18:40:47 GMT
Laljo John Pullokkaran created HIVE-5119:
--------------------------------------------

             Summary: MapJoin & Partition Pruning (MapJoin can take advantage of materialized
data to prune partitions of big table)
                 Key: HIVE-5119
                 URL: https://issues.apache.org/jira/browse/HIVE-5119
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
    Affects Versions: 0.11.0
            Reporter: Laljo John Pullokkaran
            Assignee: Laljo John Pullokkaran


Map-Join predicates where the joining columns from big table (streamed table) are partition
columns and corresponding columns from small table is not partitioned, the join would not
prune the unnecessary partitions from big table. Since data for all small tables is materialized
before big table is streamed, theoretically it would be possible to prune the unnecessary
partitions from big table.

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