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https://issues.apache.org/jira/browse/CRUNCH-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829819#comment-13829819
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Tom White commented on CRUNCH-299:
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Column projection is already supported. This change is to use Parquet's
filtering (see an example here:
https://github.com/Parquet/parquet-mr/blob/master/parquet-avro/src/test/java/parquet/avro/TestSpecificReadWrite.java#L77).
However I'm not sure how easy it would be to translate a FilterFn into
ColumnRecordFilter, since the former operates on the in-memory object while the
latter operates on the column values, and so it's not clear to me if we can
avoid the deserialization step.
> Support predicate pushdown for Parquet sources
> ----------------------------------------------
>
> Key: CRUNCH-299
> URL: https://issues.apache.org/jira/browse/CRUNCH-299
> Project: Crunch
> Issue Type: Improvement
> Components: Core
> Reporter: Tom White
> Assignee: Josh Wills
>
> We should be able to push Crunch FilterFn down to a Parquet
> ColumnRecordFilter.
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