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https://issues.apache.org/jira/browse/PIG-491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates resolved PIG-491.
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Resolution: Won't Fix
We're not going to change Pig Latin semantics at such a basic level at this
point.
> evaluate function argument expressions before the arguments are constructed
> as bags of tuples (a la SQL)
> --------------------------------------------------------------------------------------------------------
>
> Key: PIG-491
> URL: https://issues.apache.org/jira/browse/PIG-491
> Project: Pig
> Issue Type: New Feature
> Environment: pig interpreter
> Reporter: Mike Potts
>
> The final section of:
> http://wiki.apache.org/pig/PigTypesFunctionalSpec
> proposes this exact feature. The crucial excerpt is:
> The proposed solution is to change the semantics of pig, so that expression
> evaluation on function arguments is done before the arguments are constructed
> as bags of tuples, rather than afterwards. This means that the semantics
> would change so that SUM(salary * bonus_multiplier) means that for each tuple
> in grouped, the fields grouped.employee:salary and
> grouped.employee:bonus_multiplier will be multiplied and the result formed
> into tuples that are placed in a bag to be passed to the function SUM().
> This would make my pig scripts significantly shorter and easier to understand.
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