GitHub user momed-sakka closed a discussion: Link Input Singnature to Output 
signature in UDF

I would like to define a UDF which extract keys and entries from MapArray into 
a ListArray.
However creating a UDF requires specification of input types and return_types 
DataTypes. In this case I need to know the underlying datatypes (keys, values) 
of the input MapArray beforehand. is there a way to link input signature to the 
udf output ?

GitHub link: https://github.com/apache/datafusion/discussions/9427

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