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Posted to dev@pig.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2015/02/02 23:38:35 UTC

[jira] [Commented] (PIG-4406) Splits prevent optimized joins/groups

    [ https://issues.apache.org/jira/browse/PIG-4406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302076#comment-14302076 ] 

Rohini Palaniswamy commented on PIG-4406:
-----------------------------------------

[~brian@brianjohnson.cc],
    Can you elaborate more on the cases with example scripts?  I know that the SecondaryKeyOptimizer is turned off with a split making order by in a nested foreach after group by inefficient. But what is the join case you are talking about?

> Splits prevent optimized joins/groups
> -------------------------------------
>
>                 Key: PIG-4406
>                 URL: https://issues.apache.org/jira/browse/PIG-4406
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Brian Johnson
>
> If you have either an explicit or plan generated split you can't do any optimized joins or groups because it sees the split as the loader instead of the actual loader



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