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

["Thejas M Nair (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068503#comment-13068503 ] 

Thejas M Nair commented on PIG-2178:
------------------------------------

I get the correct results - (1,aline,bline) with the following -
- pig 0.8.1 released version 
- latest jar from pig 0.8 svn branch
- latest jar from pig 0.9 svn branch

Are you the first release of pig 0.8 (ie not 0.8.1 ?) . 0.8.1 has a bunch of bug fixes, it is the stable release of 0.8, you should use that.



> 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
>
> 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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