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https://issues.apache.org/jira/browse/PIG-4093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rohini Palaniswamy updated PIG-4093:
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Fix Version/s: (was: 0.17.0)
0.18.0
> Predicate pushdown to support removing filters from pig plan
> ------------------------------------------------------------
>
> Key: PIG-4093
> URL: https://issues.apache.org/jira/browse/PIG-4093
> Project: Pig
> Issue Type: Sub-task
> Reporter: Rohini Palaniswamy
> Fix For: 0.18.0
>
>
> It is possible for the loaders to evaluate the pushed filter conditions.
> In that case it is not necessary to retain the filter conditions in the pig
> plan. So need to support two modes :
> 1) filter conditions are pushed into loader but also retained in pig plan
> as loader might do only best effort filtering based on block metadata
> 2) filter conditions are pushed into loader and removed from pig plan
> when the loader can evaluate the expression itself and filter out records. In
> this case, loader can do lazy deserialization adn avoid deserialization of
> the full record.
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