crunch-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-299) Support predicate pushdown for Parquet sources
Date Fri, 22 Nov 2013 09:24:36 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829819#comment-13829819
] 

Tom White commented on CRUNCH-299:
----------------------------------

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. 



--
This message was sent by Atlassian JIRA
(v6.1#6144)

Mime
View raw message