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Very poor "similar to" performance [CORE5854] #6114

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firebird-automations opened this issue Jun 21, 2018 · 5 comments
Closed

Very poor "similar to" performance [CORE5854] #6114

firebird-automations opened this issue Jun 21, 2018 · 5 comments
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affect-version: 3.0.3 component: engine priority: major qa: done successfully resolution: duplicate type: bug

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Submitted by: Sergey Borisov (bsv)

Duplicates CORE5664

--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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Commented by: Sergey Borisov (bsv)

The same geometric growth of time execution can be obtained by increasing the maximum number of symbols in regexp: {1,60}, {1,80}, {1,100}, etc.
So, this query take more then 2 minutes:
select iif ('abc.abc' similar to '[[:ALPHA:].]{1,80}.ab' ,1,0) is_similar from rdb$database

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Modified by: @asfernandes

Link: This issue duplicates CORE5664 [ CORE5664 ]

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Modified by: @asfernandes

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Duplicate [ 3 ]

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Modified by: @pcisar

status: Resolved [ 5 ] => Closed [ 6 ]

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Modified by: @pavel-zotov

status: Closed [ 6 ] => Closed [ 6 ]

QA Status: No test => Done successfully

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affect-version: 3.0.3 component: engine priority: major qa: done successfully resolution: duplicate type: bug
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