[ 
https://issues.apache.org/jira/browse/ARROW-15492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17487634#comment-17487634
 ] 

Micah Kornfield commented on ARROW-15492:
-----------------------------------------

On the exposing the write field, per the other Jira I don't think we should do 
it.  It makes it much harder to deal with bugs that might occur in a particular 
version of the library.

 
{quote}Or handle the timestamp type with timezone which files created by 
parquet-mr?
{quote}
I'm not familiar with this, could you link the to specification on this or 
provide more details?  It seems like this might be a better approach.

> [Python] handle timestamp type in parquet file for compatibility with older 
> HiveQL
> ----------------------------------------------------------------------------------
>
>                 Key: ARROW-15492
>                 URL: https://issues.apache.org/jira/browse/ARROW-15492
>             Project: Apache Arrow
>          Issue Type: New Feature
>    Affects Versions: 6.0.1
>            Reporter: nero
>            Priority: Major
>
> Hi there,
> I face an issue when I write a parquet file by PyArrow.
> In the older version of Hive, it can only recognize the timestamp type stored 
> in INT96, so I use table.write_to_data with `use_deprecated 
> timestamp_int96_timestamps=True` option to save the parquet file. But the 
> HiveQL will skip conversion when the metadata of parquet file is not 
> created_by "parquet-mr".
> [hive/ParquetRecordReaderBase.java at 
> f1ff99636a5546231336208a300a114bcf8c5944 · apache/hive 
> (github.com)|https://github.com/apache/hive/blob/f1ff99636a5546231336208a300a114bcf8c5944/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/ParquetRecordReaderBase.java#L137-L139]
>  
> So I have to save the timestamp columns with timezone info(pad to UTC+8).
> But when pyarrow.parquet read from a dir which contains parquets created by 
> both PyArrow and parquet-mr, Arrow.Table will ignore the timezone info for 
> parquet-mr files.
>  
> Maybe PyArrow can expose the created_by option in pyarrow({*}prefer{*}, 
> parquet::WriterProperties::created_by is available in the C++ ).
> Or handle the timestamp type with timezone which files created by parquet-mr?
>  
> Maybe related to https://issues.apache.org/jira/browse/ARROW-14422



--
This message was sent by Atlassian Jira
(v8.20.1#820001)

Reply via email to