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https://issues.apache.org/jira/browse/DRILL-7864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17313065#comment-17313065
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Matthias Rosenthaler commented on DRILL-7864:
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[~apitrou]: yes that proofs that the bugs seems to be on drill side. Not all
float columns are affected an only a small portions of parquet files including
float columns are corrupted. Around 1 % of the files get corrupted. There muste
be any special criteria which has to be met which cause this problem.
> Parquet file could not be read correctly
> ----------------------------------------
>
> Key: DRILL-7864
> URL: https://issues.apache.org/jira/browse/DRILL-7864
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - Parquet
> Affects Versions: 1.18.0
> Reporter: Matthias Rosenthaler
> Priority: Major
> Attachments: drill_query.csv, output.parquet, parquet-dotnet.csv
>
>
> The following parquet file which is generated by ParquetSharp (which is using
> the underlying apache arrow c++ lib) is not readable by drill. The values of
> the columns are displaced. If I write the affected float32 columns
> "InjectionRate" and "I_injection_IA" as float64, everything is fine.
> Update: It seems that the bug is *caused by dictionary encoding*. If I turn
> this feature of, drill is able to read it. So please take a look into reading
> dictionary encoded columns in drill to solve the bug.
> Also created a ticket for the arrow project, but they redirect me to the
> drill project. https://issues.apache.org/jira/browse/ARROW-11629
>
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