Joris Van den Bossche reassigned ARROW-6187:

    Assignee: Joris Van den Bossche

> [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
>            Assignee: 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). 

This message was sent by Atlassian Jira

Reply via email to