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Posted to issues@beam.apache.org by "Heejong Lee (Jira)" <ji...@apache.org> on 2020/05/07 22:58:00 UTC
[jira] [Assigned] (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:all-tabpanel ]
Heejong Lee reassigned BEAM-7925:
---------------------------------
Assignee: Heejong Lee
> 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
> Assignee: Heejong Lee
> Priority: Major
>
> 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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