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https://issues.apache.org/jira/browse/SPARK-23388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362730#comment-16362730
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Sameer Agarwal commented on SPARK-23388:
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yes, I agree

> Support for Parquet Binary DecimalType in VectorizedColumnReader
> ----------------------------------------------------------------
>
>                 Key: SPARK-23388
>                 URL: https://issues.apache.org/jira/browse/SPARK-23388
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: James Thompson
>            Assignee: James Thompson
>            Priority: Major
>             Fix For: 2.3.1
>
>
> The following commit to spark removed support for decimal binary types: 
> [https://github.com/apache/spark/commit/9c29c557635caf739fde942f53255273aac0d7b1#diff-7bdf5fd0ce0b1ccbf4ecf083611976e6R428]
> As per the parquet spec, decimal can be used to annotate binary types, so 
> support should be re-added: 
> [https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#decimal]



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