[jira] [Commented] (DRILL-7864) Parquet file could not be read correctly

["Matthias Rosenthaler (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-7864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17292903#comment-17292903 ] 

Matthias Rosenthaler commented on DRILL-7864:
---------------------------------------------

[~cgivre], don't think so, but as soon as you merged the ticket I could make a test. The problem is I don't know if the bug is on arrow or drill side. But it is a very important bug which should be fixed because in this way the dictionary encoding feature is not usable. I am wondering why nobody else is affected by this bug.

> 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: output.parquet
>
>
> 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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