[ https://issues.apache.org/jira/browse/ARROW-6187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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 (v8.3.4#803005)