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What are the functions used for adding Column level and Table level UDP's checked Index.html couldn't find anything.
rqEval can accept non-numeric types as input.
In your example, 'select 1 "Industry" forces a returned numeric value. It fails because the data returned contains 1 non-numeric column. The output doesn't match the specification in the SQL provided, and an error is returned.
Instead, use cast to return as varchar as follows:
SQL> select * from table(rqEval(
NULL,
'select cast(''Industry'' as varchar2(8)) "Industry" from dual',
'Test'));
Returns:
1 Text