[jira] [Commented] (PARQUET-1095) [C++] Read and write Arrow decimal values

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-1095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258556#comment-16258556 ] 

ASF GitHub Bot commented on PARQUET-1095:
-----------------------------------------

wesm commented on issue #403: PARQUET-1095: [C++] Read and write Arrow decimal values
URL: https://github.com/apache/parquet-cpp/pull/403#issuecomment-345539614
 
 
   @cpcloud is this merge-ready once the build passes? I just opened https://issues.apache.org/jira/browse/ARROW-1836 about fixing the warning I just triaged here

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> [C++] Read and write Arrow decimal values
> -----------------------------------------
>
>                 Key: PARQUET-1095
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1095
>             Project: Parquet
>          Issue Type: New Feature
>          Components: parquet-cpp
>            Reporter: Wes McKinney
>            Assignee: Phillip Cloud
>             Fix For: cpp-1.4.0
>
>
> We now have 16-byte decimal values in Arrow which have been validated against the Java implementation. We need to be able to read and write these to Parquet format. 
> To make these values readable by Impala or some other Parquet readers may require some work. It expects the storage size to match the decimal precision exactly. So in parquet-cpp we will need to write the correct non-zero bytes into a FIXED_LEN_BYTE_ARRAY of the appropriate size.
> We should validate this against Java Parquet implementations



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