nero created ARROW-15492:
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Summary: [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
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
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