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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2391) Create a LoadPushDown implementation for CassandraStorage
Date Sat, 26 Mar 2011 18:22:05 GMT
Create a LoadPushDown implementation for CassandraStorage
---------------------------------------------------------

                 Key: CASSANDRA-2391
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2391
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Jeremy Hanna
            Priority: Minor


A LoadPushDown is nice for use with Pig because if you do something like:
{code}
rows = LOAD 'cassandra://ks/cf' USING CassandraStorage();
A = FOREACH rows GENERATE $0;
{code}
It would push down the projection and only get the keys from Cassandra instead of all of the
rows - it allows Pig to optimize what it gets from Cassandra when it looks at the pig script.
 The script above might not be the best example but projections would allow pig to optimize
retrieval from Cassandra in something like that.

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