Обсуждение: [BUGS] 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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