Joris Van den Bossche created ARROW-7703:
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Summary: [C++][Dataset] Give more informative error message for
mismatching schemas for FileSystemSources
Key: ARROW-7703
URL: https://issues.apache.org/jira/browse/ARROW-7703
Project: Apache Arrow
Issue Type: Bug
Reporter: Joris Van den Bossche
Currently, if you try to create a dataset from files with different schemes,
you get this error:
{code}
ArrowInvalid: Unable to merge: Field a has incompatible types: int64 vs int32
{code}
If you are reading a directory of files, it would be very helpful if the error
message can indicate which files are involved here (eg if you have a lot of
files and only one has an error).
You can already inspect the schema's if you first make a SourceFactory
manually, but that also only gives a list of schema's, not mapped to the
original file (this last item probably relates to ARROW-7608
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