Olga Natkovich resolved PIG-49.

    Resolution: Won't Fix

> optimize bag usage
> ------------------
>                 Key: PIG-49
>                 URL: https://issues.apache.org/jira/browse/PIG-49
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
> (1) Currently, we always bring the entire bag into memory even though in most 
> cases we just need to stream through it. This is very inefficient in terms of 
> memory and CPU usage.
> (2) If we are doing multiple computations on the same group, we iterate over 
> the bag that represents the group several times. This is very inefficient 
> especially for spilled bags.

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