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https://issues.apache.org/jira/browse/PIG-4767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082502#comment-16082502
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Anthony Hsu commented on PIG-4767:
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Thanks for the patch, [~knoguchi]! I tested it out and it solves my problem.
> Partition filter not pushed down when filter clause references variable from
> another load path
> ----------------------------------------------------------------------------------------------
>
> Key: PIG-4767
> URL: https://issues.apache.org/jira/browse/PIG-4767
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.15.0
> Reporter: Anthony Hsu
> Assignee: Koji Noguchi
> Fix For: 0.18.0
>
> Attachments: pig-4767-v01.patch
>
>
> To reproduce:
> {noformat:title=test.pig}
> a = load 'a.txt';
> a_group = group a all;
> a_count = foreach a_group generate COUNT(a) as count;
> b = load 'mytable' using org.apache.hcatalog.pig.HCatLoader();
> b = filter b by datepartition == '2015-09-01-00' and foo == a_count.count;
> dump b;
> {noformat}
> The above query ends up reading all the table partitions. If you remove the
> {{foo == a_count.count}} clause or replace {{a_count.count}} with a constant,
> then partition filtering happens properly.
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