changed answer of question #2 #1
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current answer result:
edgedb> SELECT (Person.name, find(Person.name, 'ma'));
{('Lucy', -1), ('Count Dracula', -1), ('Crewman 1', 4)}
new answer result:
edgedb> with x := (select (Person.name, find(Person.name, 'ma')))
select x.0 filter x.1 > -1;
{'Crewman 1'}