comphead commented on PR #5186:
URL: https://github.com/apache/arrow-rs/pull/5186#issuecomment-1992062531
> Apologies for the delay, coming back to this and honestly a little
confused as to the use-case. The updated error message uses the new field_names
method, but the RecordBatch method itself is not concerned with nested fields,
and so printing the nested fields is actually just confusing? It should only
print the first level of field names, as that is all RecordBatch is concerned
with?
Thanks @tustvold for having the time for this. The PR is planned to make
debugging easier and improve the error text which is currently too unclear.
```
Arrow error: Invalid argument error: number of columns(2) must match number
of fields(1) in schema
```
The idea is to show which fields exists, and which are missing in the
schema. But if the field is nested we should display it in user-friendly way.
You are correct about using dots to separate parent field and child fields,
this is not very good idea as dots also used in catalog/schema/table qualifiers.
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