[jira] [Commented] (BEAM-7925) ParquetIO supports neither column projection nor filter predicate

["Beam JIRA Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-7925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17198459#comment-17198459 ] 

Beam JIRA Bot commented on BEAM-7925:
-------------------------------------

This issue is P2 but has been unassigned without any comment for 60 days so it has been labeled "stale-P2". If this issue is still affecting you, we care! Please comment and remove the label. Otherwise, in 14 days the issue will be moved to P3.

Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed explanation of what these priorities mean.


> 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: P2
>              Labels: stale-P2
>          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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