[jira] Reopened: (PIG-1184) PruneColumns optimization does not handle the case of foreach flatten correctly if flattened bag is not used later

["Daniel Dai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai reopened PIG-1184:
-----------------------------


Still need to address core test failures.

> PruneColumns optimization does not handle the case of foreach flatten correctly if flattened bag is not used later
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-1184
>                 URL: https://issues.apache.org/jira/browse/PIG-1184
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.6.0
>            Reporter: Pradeep Kamath
>            Assignee: Daniel Dai
>             Fix For: 0.7.0
>
>         Attachments: PIG-1184-1.patch
>
>
> The following script :
> {noformat}
> -e "a = load 'input.txt' as (f1:chararray, f2:chararray, f3:bag{t:tuple(id:chararray)}, f4:bag{t:tuple(loc:chararray)}); b = foreach a generate f1, f2, flatten(f3), flatten(f4), 10; b = foreach b generate f1, f2, \$4; dump b;"
> {noformat}
> gives the following result:
> (oiue,M,10)
> {noformat}
> cat input.txt:
> oiue    M       {(3),(4)}       {(toronto),(montreal)}
> {noformat}
> If PruneColumns optimizations is disabled, we get the right result:
> (oiue,M,10)
> (oiue,M,10)
> (oiue,M,10)
> (oiue,M,10)
> The flatten results in 4 records - so the output should contain 4 records.

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