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Posted to commits@cassandra.apache.org by "Alex Liu (JIRA)" <ji...@apache.org> on 2015/01/14 00:08:35 UTC
[jira] [Commented] (CASSANDRA-8576) Primary Key Pushdown For Hadoop
[ https://issues.apache.org/jira/browse/CASSANDRA-8576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276140#comment-14276140 ]
Alex Liu commented on CASSANDRA-8576:
-------------------------------------
Should it work only for EQ predicates? Should it also include IN predicates?
> Primary Key Pushdown For Hadoop
> -------------------------------
>
> Key: CASSANDRA-8576
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8576
> Project: Cassandra
> Issue Type: Improvement
> Components: Hadoop
> Reporter: Russell Alexander Spitzer
>
> I've heard reports from several users that they would like to have predicate pushdown functionality for hadoop (Hive in particular) based services.
> Example usecase
> Table with wide partitions, one per customer
> Application team has HQL they would like to run on a single customer
> Currently time to complete scales with number of customers since Input Format can't pushdown primary key predicate
> Current implementation requires a full table scan (since it can't recognize that a single partition was specified)
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