BUG #14688: Wrong results in LIKE operation on JSON Type
The following bug has been logged on the website:
Bug reference: 14688
Logged by: Ilya Kopylov
Email address: nblxa@mail.ru
PostgreSQL version: 9.6.0
Operating system: Windows 8.1
Description:
When JSON contains '\\' symbol, then operator '=' works well, but operator
'LIKE' return wrong result.
SELECT '{"Name":"Domen\\Ivan"}'::json ->> 'Name' = 'Domen\Ivan'; -- yields
true
SELECT '{"Name":"Domen\\Ivan"}'::json ->> 'Name' LIKE 'Domen\Ivan'; --
yields false
SELECT '{"Name":"Domen\\Ivan"}'::json ->> 'Name' LIKE 'Domen\\Ivan'; --
yields true
When I search with 'LIKE' operator and adding '\' symbol, when got result. I
think whis is bug.
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nblxa@mail.ru writes:
When JSON contains '\\' symbol, then operator '=' works well, but operator
'LIKE' return wrong result.
SELECT '{"Name":"Domen\\Ivan"}'::json ->> 'Name' = 'Domen\Ivan'; -- yields
true
SELECT '{"Name":"Domen\\Ivan"}'::json ->> 'Name' LIKE 'Domen\Ivan'; --
yields false
SELECT '{"Name":"Domen\\Ivan"}'::json ->> 'Name' LIKE 'Domen\\Ivan'; --
yields true
I think you've forgotten that backslash is an escape character in LIKE
patterns. You could use ... LIKE 'Domen\Ivan' ESCAPE '' if you don't
want that behavior.
https://www.postgresql.org/docs/current/static/functions-matching.html#FUNCTIONS-LIKE
regards, tom lane
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