Very poor "similar to" performance
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Key: CORE-5854
URL: http://tracker.firebirdsql.org/browse/CORE-5854
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0.3
Reporter: Sergey Borisov
--This simple query take more than 16 secs of execution:
select iif ('abc.abc' similar to '[[:ALPHA:].]{1,60}.ab' ,1,0) is_similar from
rdb$database
--Then add one more symbol to text, and execution take more then 2 MINUTES!!!
select iif ('abcd.abc' similar to '[[:ALPHA:].]{1,60}.ab' ,1,0) is_similar from
rdb$database
If the test string is even longer than 4 symbols, then the server hangs forever!
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