Hong Tang commented on PIG-833:

@Jeff, I might have read a bit too much into the lines. I was referring to your 
comments on PIG-824.

I also took a look at HIVE-279, the predicate push down mentioned there is 
actually a bit different from what we plan to do. HIVE-279 pushes predicates to 
map phase, whereby we would like to implement a storage layer where we can 
filter out bytes while reading data from disk.

> Storage access layer
> --------------------
>                 Key: PIG-833
>                 URL: https://issues.apache.org/jira/browse/PIG-833
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Jay Tang
> A layer is needed to provide a high level data access abstraction and a 
> tabular view of data in Hadoop, and could free Pig users from implementing 
> their own data storage/retrieval code.  This layer should also include a 
> columnar storage format in order to provide fast data projection, 
> CPU/space-efficient data serialization, and a schema language to manage 
> physical storage metadata.  Eventually it could also support predicate 
> pushdown for further performance improvement.  Initially, this layer could be 
> a contrib project in Pig and become a hadoop subproject later on.

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