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Posted to jira@arrow.apache.org by "Dimitrij Denissenko (Jira)" <ji...@apache.org> on 2020/06/16 16:39:00 UTC

[jira] [Commented] (ARROW-9137) [GLib][Ruby] Allow to read Parquet files in chunks (by RowGroup)

    [ https://issues.apache.org/jira/browse/ARROW-9137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17136802#comment-17136802 ] 

Dimitrij Denissenko commented on ARROW-9137:
--------------------------------------------

This applies not just to Ruby but also to Python.

> [GLib][Ruby] Allow to read Parquet files in chunks (by RowGroup)
> ----------------------------------------------------------------
>
>                 Key: ARROW-9137
>                 URL: https://issues.apache.org/jira/browse/ARROW-9137
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: GLib, Python, Ruby
>    Affects Versions: 0.17.1
>            Reporter: Dimitrij Denissenko
>            Priority: Major
>
> At the moment only `gparquet_arrow_file_reader_read_table` is exported which requires the reader to load all row-groups. Additionally, it would be extremely helpful to have access to the `ReadRowGroup` method which would allow reading parts of the file without having to load everything into memory.



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