when using TI in following sql it works just fine to get a list of columns for last expression with a as ( select distinct object_type from user_objects ) select distinct a.object_type, a. from a once I have union in it (see below), TI list of columns is empty. with a as ( select distinct object_type from user_objects union all select 'aaaa' from dual ) select distinct a.object_type, a. from a
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