To get column name instead of value.

Hi,

I need to return column name of the input parameter passed to a custom function. Is it possible ? The custom function will check for parameter value and based on some logic it should return the column name.

Query1 ----> custom_fn(Query1.column_name)

Inside function we will get the value usin $input_param. But how to get the actual column name passed as parameter?

Thx,