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with r (l, dummy_coll, b) as ( select 1 as l, sys.ku$_vcnt(), null from dual union all select l + 1 , r.dummy_coll , case when r.dummy_coll is not null then 'not null' else 'null' end as b from r where l < 5 and r.dummy_coll is not null ) select * from r;
ORA-00932: inconsistent datatypes: expected UDT got SYS.KU$_VCNT