[jira] [Resolved] (PIG-2178) Filtering a source and then merging the filtered rows only generates data from one half of the filtering

["Derek Wollenstein (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Derek Wollenstein resolved PIG-2178.
------------------------------------

       Resolution: Not A Problem
    Fix Version/s: 0.8.1

I took a look, and you were right.  I was using 0.8.0, so this bug is incorrect.  And I'll take your word for the fact that this isn't an issue in 0.8.1

Locally I was able to correct the problem by loading the file twice (ORIGA and ORIGB).

I just wanted to make sure this was noted for future fixes.  If 0.8.1 takes care of that then I'll go and upgrade on my end.  Sorry for the trouble.

> Filtering a source and then merging the filtered rows only generates data from one half of the filtering
> --------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-2178
>                 URL: https://issues.apache.org/jira/browse/PIG-2178
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.8.1
>            Reporter: Derek Wollenstein
>             Fix For: 0.8.1
>
>
> Pig is generating a plan that eliminates half of input data when using FILTER BY
> To better illustrate, I created a small test case.
> 1. Create a file in HDFS called "/testinput"
>    The contents of the file should be:
> "1\ta\taline\n1\tb\tbline"
> 2. Run the following pig script:
> ORIG = LOAD '/testinput' USING PigStorage() AS (parent_id: chararray, child_id:chararray, value:chararray);
> -- Split into two inputs based on the value of child_id
> A = FILTER ORIG BY child_id =='a';
> B = FILTER ORIG BY child_id =='b';
> -- Project out the column which chooses the correct data set
> APROJ = FOREACH A GENERATE parent_id, value;
> BPROJ = FOREACH B GENERATE parent_id, value;
> -- Merge both datasets by parent id
> ABMERGE = JOIN APROJ by parent_id FULL OUTER, BPROJ by parent_id;
> -- Project the result
> ABPROJ = FOREACH ABMERGE GENERATE APROJ::parent_id AS parent_id, APROJ::value,BPROJ::value;
> DUMP ABPROJ;
> 3. The resulting tuple will be
> (1,aline,aline)

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