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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