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https://issues.apache.org/jira/browse/ARROW-11629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17310419#comment-17310419
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Micah Kornfield commented on ARROW-11629:
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[~matthros] and apologies Was "[https://github.com/mukunku/ParquetViewer] v.
2.0.2" as typo. Did you mean 2.2? if I'm tracing the code correctly, it looks
like [https://github.com/aloneguid/parquet-dotnet/issues/81] didn't make it
into ParquetViewer until 2.2 (and this could explain why it is broken).
> [C++] Writing float32 values with "Dictionary Encoding" 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: foo.parquet, image-2021-02-15-15-49-41-908.png,
> 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.
>
> Update: Bug in "*Dictionary Encoding*" feature. If I switch it off for
> float32 columns, everything works as expected.
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