[jira] [Updated] (PIG-2673) Allow Merge join to follow an ORDER statement

["Dmitriy V. Ryaboy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-2673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy V. Ryaboy updated PIG-2673:
-----------------------------------

    Attachment: PIG-2673_0.patch

Attaching patch that relaxes the sanity checks and updates the documentation.

Note that while working on this patch I discovered we never enforced a stated condition for the merge join, which is that you cannot call UDFs on the data between a load and a merge join. This is also fixed in this patch. This fix may break people's script in cases when they were using UDFs and unwittingly violating the documented constraint.
                
> Allow Merge join to follow an ORDER statement
> ---------------------------------------------
>
>                 Key: PIG-2673
>                 URL: https://issues.apache.org/jira/browse/PIG-2673
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Dmitriy V. Ryaboy
>            Assignee: Dmitriy V. Ryaboy
>         Attachments: PIG-2673_0.patch
>
>
> Currently, we insist that data for a merge join must come from an OrderedLoadFunc.
> We can relax this condition and allow explicit ordering operations to precede a MergeJoin.

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