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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (PIG-778) ReversibleLoadStore Semantics
Date Mon, 03 May 2010 17:23:56 GMT

     [ https://issues.apache.org/jira/browse/PIG-778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Olga Natkovich resolved PIG-778.

    Resolution: Won't Fix

This becomes irrelevant after Pig 0.7.0

> ReversibleLoadStore Semantics
> -----------------------------
>                 Key: PIG-778
>                 URL: https://issues.apache.org/jira/browse/PIG-778
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Gunther Hagleitner
> The question about how to use the ReversibleLoadStore function came up in 2 scenarios
> a) Can we generate a load operator from a store by simply taking the same store function
string, if the store function is a ReversibleLoadStore function? I would like to use that
to remove unnecessary compiler generated stores, if we can change the depending load operators
to load from a different store. 
> b) Is it sufficient to check whether a pair of store and load operations on the same
location is reversible to know whether we can eliminate it without changing the data? This
is done in the pig server for logical plans right now.
> If I go by PigStorage then, the answer to (a) is yes. The answer to (b) is no, but we
also need to check that both load and store use the same parameter to the reversible function.

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