[jira] [Commented] (ARROW-11629) [C++] Writing float32 values makes parquet files not readable for some tools

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-11629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17284756#comment-17284756 ] 

Joris Van den Bossche commented on ARROW-11629:
-----------------------------------------------

The Parquet format supports both FLOAT and DOUBLE as physical type (float32/float64), so this should normally work. Do you get a specific error message with drill / Parquet.Net ?

> [C++] Writing float32 values makes parquet files not readable for some tools
> ----------------------------------------------------------------------------
>
>                 Key: ARROW-11629
>                 URL: https://issues.apache.org/jira/browse/ARROW-11629
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Python
>    Affects Versions: 3.0.0
>            Reporter: Matthias Rosenthaler
>            Priority: Major
>         Attachments: output.csv, output.parquet
>
>
> If I try to read the attached csv file with pyarrow, changing the float64 columns to float32 and export it to parquet, the parquet file gets corrupted. It is not readable for apache drill or Parquet.Net any longer.



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