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https://issues.apache.org/jira/browse/PIG-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486344#comment-13486344
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Rohini Palaniswamy commented on PIG-2968:
-----------------------------------------
Koji/Cheolsoo,
bq. But I couldn't come up with expected raw query that matches the pruned
result.
I missed commenting on this in the initial review. Should we take a crack at
this before committing this. Or at least some Assert?
> ColumnMapKeyPrune fails to prune a subtree inside foreach
> ---------------------------------------------------------
>
> Key: PIG-2968
> URL: https://issues.apache.org/jira/browse/PIG-2968
> Project: Pig
> Issue Type: Bug
> Components: parser
> Reporter: Koji Noguchi
> Assignee: Koji Noguchi
> Priority: Minor
> Fix For: 0.11
>
> Attachments: pig-2968-trunk_v01.txt, pig-2968-trunk_v02.txt
>
>
> Sample code
> {noformat}
> $ cat test/foreach.pig
> daily = load 'nyse' as (exchange, symbol);
> grpd = group daily by exchange;
> uniquecnt = foreach grpd {
> sym = daily.symbol;
> uniq_sym = distinct sym;
> generate group, uniq_sym;
> };
> another = FOREACH uniquecnt GENERATE group;
> explain another;
> {noformat}
> This breaks when it tries to prune uniq_sym->sym->innerload_daily
> bq. 2012-10-12 14:54:11,031 [main] ERROR org.apache.pig.tools.grunt.Grunt -
> ERROR 2000: Error processing rule ColumnMapKeyPrune. Try -t ColumnMapKeyPrune
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