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ALTER VIEW crashes the server if the new version has an artificial (aggregate or union) stream at the position of a regular context in the older version [CORE3503]
#3861
Submitted by: @dyemanov
Test case:
create or alter view v_test (id, col)
as
select rdb$relation_id, 1 from rdb$relations;
commit;
-- reconnect;
create or alter view v_test (id)
as
select rdb$relation_id from rdb$relations
union all
select rdb$relation_id from rdb$relations;
commit; -- here the crash happens
This is a regression introduced while fixing CORE2386.
Commits: 2e214d5 ebd9234 190abcf
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