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https://issues.apache.org/jira/browse/ARROW-8657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17096866#comment-17096866
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Wes McKinney edited comment on ARROW-8657 at 4/30/20, 6:37 PM:
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For the record, I think we need to introduce a new flag to toggle the use of
newer logical types and associated casting/metadata behavior, and leave the
1.0/2.0 flag for its intended use, i.e. the DataPageV1 vs DataPageV2
So my suggested fix is:
* Add the new flag that is separate from switching version 1.0/2.0
* Revert the behavior in Python of version='2.0' to use DataPageV1, **but issue
a FutureWarning to get people to use the new flag**
* In a future release (maybe 2 releases from now), {{version='2.0'}} will again
write DataPageV2
was (Author: wesmckinn):
For the record, I think we need to introduce a new flag to toggle the use of
newer logical types and associated casting/metadata behavior, and leave the
1.0/2.0 flag for its intended use, i.e. the DataPageV1 vs DataPageV2
So my suggested fix is:
* Add the new flag that is separate from switching version 1.0/2.0
* Revert the behavior in Python of version='2.0' to use DataPageV1, **but make
a future warning to get people to use the new flag**
* In a future release (maybe 2 releases from now), {{version='2.0'}} will again
write DataPageV2
> [Python][C++][Parquet] Forward compatibility issue from 0.16 to 0.17 when
> using version='2.0'
> ---------------------------------------------------------------------------------------------
>
> Key: ARROW-8657
> URL: https://issues.apache.org/jira/browse/ARROW-8657
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 0.17.0
> Reporter: Pierre Belzile
> Priority: Major
>
> With the recent release of 0.17, the ParquetVersion is used to define the
> logical type interpretation of fields and the selection of the DataPage
> format.
> As a result all parquet files that were created with ParquetVersion::V2 to
> get features such as unsigned int32s, timestamps with nanosecond resolution,
> etc are now unreadable. That's TBs of data in my case.
> Those two concerns should be separated. Given that that DataPageV2 pages were
> not written prior to 0.17 and in order to allow reading existing files, the
> existing version property should continue to operate as in 0.16 and inform
> the logical type mapping.
> Some consideration should be given to issue a release 0.17.1.
>
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