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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hive/PartitionedViews" by JohnSichi
Date Wed, 02 Feb 2011 00:56:29 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Hive/PartitionedViews" page has been changed by JohnSichi.
http://wiki.apache.org/hadoop/Hive/PartitionedViews?action=diff&rev1=6&rev2=7

--------------------------------------------------

  
  Likewise, suppose you have view V2 which selects from T1 (with no WHERE clause) and is partitioned
on C2.  Then a query such as SELECT * FROM V2 WHERE C2=3 will fail; even though the view partition
column is constrained, there is no predicate on the underlying T1's partition column C1.
  
+ = View Definition Changes =
+ 
+ Currently, changing a view definition requires dropping the view and recreating it.  This
implies dropping and recreating all existing partitions as well, which could be very expensive.
+ 
+ This implies that followup support for [[https://issues.apache.org/jira/browse/HIVE-1078|CREATE
OR REPLACE]] is very important, and that it needs to preserve existing partitions (after validating
that they are still compatible with the new view definition).
+ 

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