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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1693) There needs to be a way in foreach to indicate "and all the rest of the fields"
Date Fri, 22 Oct 2010 17:56:05 GMT
There needs to be a way in foreach to indicate "and all the rest of the fields"
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                 Key: PIG-1693
                 URL: https://issues.apache.org/jira/browse/PIG-1693
             Project: Pig
          Issue Type: New Feature
          Components: impl
            Reporter: Alan Gates


A common use case we see in Pig is people have many columns in their data and they only want
to operate on a few of them.  Consider for example if before storing data with ten columns,
the user wants to perform a cast on one column:

{code}
...
Z = foreach Y generate (int)firstcol, secondcol, thridcol, forthcol, fifthcol, sixthcol, seventhcol,
eigthcol, ninethcol, tenthcol;
store Z into 'output';
{code}

Obviously this only gets worse as the user has more columns.  Ideally the above could be transformed
to something like:

{code}
...
Z = foreach Y generate (int)firstcol, "and all the rest";
store Z into 'output'
{code}

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