Hi, Currently the ORC reader can read ORC metadata of a table. However it doesn’t actually write the obtained metadata into the schema of the resulting Arrow Table. The ORC writer can not write either field-specific or schema-level metadata from Arrow Tables into ORC.
I wonder whether we should change the current behavior and read ORC metadata as schema-level metadata in Arrow. As for writing I’m not sure whether we should begin to write schema-level metadata as ORC metadata. Maybe we can make that optional? It is even less clear what we should do about the field-level metadata. Shall we add the field name & an underscore as a prefix and write it to ORC? That doesn’t look very elegant. Thanks, Ian
