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Posted to issues@beam.apache.org by "Chamikara Madhusanka Jayalath (Jira)" <ji...@apache.org> on 2020/11/13 22:26:00 UTC
[jira] [Commented] (BEAM-7925) ParquetIO supports neither column
projection nor filter predicate
[ https://issues.apache.org/jira/browse/BEAM-7925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231858#comment-17231858 ]
Chamikara Madhusanka Jayalath commented on BEAM-7925:
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Can this Jira be resolved since [https://github.com/apache/beam/pull/12786] went in ?
cc: [~heejong] [~danielxjd]
> ParquetIO supports neither column projection nor filter predicate
> -----------------------------------------------------------------
>
> Key: BEAM-7925
> URL: https://issues.apache.org/jira/browse/BEAM-7925
> Project: Beam
> Issue Type: Improvement
> Components: io-java-parquet
> Affects Versions: 2.14.0
> Reporter: Neville Li
> Priority: P3
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> Current {{ParquetIO}} supports neither column projection nor filter predicate which defeats the performance motivation of using Parquet in the first place. That's why we have our own implementation of [ParquetIO|https://github.com/spotify/scio/tree/master/scio-parquet/src] in Scio.
> Reading Parquet as Avro with column projection has some complications, namely, the resulting Avro records may be incomplete and will not survive ser/de. A workaround maybe provide a {{TypedRead}} interface that takes a {{Function<A, B>}} that maps invalid Avro {{A}} into user defined type {{B}}.
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