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https://issues.apache.org/jira/browse/ARROW-6187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou updated ARROW-6187:
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Fix Version/s: 1.0.0
> [C++] fallback to storage type when writing ExtensionType to Parquet
> --------------------------------------------------------------------
>
> Key: ARROW-6187
> URL: https://issues.apache.org/jira/browse/ARROW-6187
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Joris Van den Bossche
> Priority: Major
> Labels: parquet
> Fix For: 1.0.0
>
>
> Writing a table that contains an ExtensionType array to a parquet file is not
> yet implemented. It currently raises "ArrowNotImplementedError: Unhandled
> type for Arrow to Parquet schema conversion:
> extension<arrow.py_extension_type>" (for a PyExtensionType in this case).
> I think minimal support can consist of writing the storage type / array.
> We also might want to save the extension name and metadata in the parquet
> FileMetadata.
> Later on, this could be potentially be used to restore the extension type
> when reading. This is related to other issues that need to save the arrow
> schema (categorical: ARROW-5480, time zones: ARROW-5888). Only in this case,
> we probably want to store the serialised type in addition to the schema
> (which only has the extension type's name).
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