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