dadepo commented on issue #8866:
URL:
https://github.com/apache/arrow-datafusion/issues/8866#issuecomment-1913562175
> I think the key thing a UDF writer needs to have is access to the number
of output rows to produce.
@alamb Any pointers on how to get this info? I have switched to an
implementation that does not use `make_scalar_function` but implements the UDF
directly as `ScalarFunctionImplementation` but now run into a different
situation, where
- the udf only returns one row if used with no arguments (even if the
context of the table it is used with has many rows)
- the udf is used in the same query - with and without a column argument,
then it fails with `Error: ArrowError(InvalidArgumentError("all columns in a
record batch must have the same length"), None)`
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