Обсуждение: BUG #9038: trgm must have operand in index creation

The following bug has been logged on the website:

Bug reference:      9038
Logged by:          Craig Macdonald
Email address:      craig.macdonald@glasgow.ac.uk
PostgreSQL version: 9.2.0
Operating system:   Documentation
Description:

The documentation at
http://www.postgresql.org/docs/9.2/static/textsearch-indexes.html
is incorrect in the syntax of CREATE INDEX for GIN and GIST. According to
http://www.postgresql.org/docs/9.2/static/pgtrgm.html the keyword
gist_trgm_ops is also necessary:

test=> CREATE INDEX trgm_idx ON test_trgm USING gist (t);
ERROR:  data type text has no default operator class for access method
"gist"
test=> CREATE INDEX trgm_idx ON test_trgm USING gist (t gist_trgm_ops);
CREATE INDEX

No it's not. The documentation about full-text clearly states that the column needs to be either tsvector or tsquery,
butyou're clearly using text. 

Tomas

craig.macdonald@glasgow.ac.uknapsal/a:

>The following bug has been logged on the website:
>
>Bug reference:      9038
>Logged by:          Craig Macdonald
>Email address:      craig.macdonald@glasgow.ac.uk
>PostgreSQL version: 9.2.0
>Operating system:   Documentation
>Description:
>
>The documentation at
>http://www.postgresql.org/docs/9.2/static/textsearch-indexes.html
>is incorrect in the syntax of CREATE INDEX for GIN and GIST. According to
>http://www.postgresql.org/docs/9.2/static/pgtrgm.html the keyword
>gist_trgm_ops is also necessary:
>
>test=> CREATE INDEX trgm_idx ON test_trgm USING gist (t);
>ERROR:  data type text has no default operator class for access method
>"gist"
>test=> CREATE INDEX trgm_idx ON test_trgm USING gist (t gist_trgm_ops);
>CREATE INDEX
>
>
>
>--
>Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org)
>To make changes to your subscription:
>http://www.postgresql.org/mailpref/pgsql-bugs

Tomáš Vondra <tv@fuzzy.cz> writes:
> craig.macdonald@glasgow.ac.uknapsal/a:
>> The documentation at
>> http://www.postgresql.org/docs/9.2/static/textsearch-indexes.html
>> is incorrect in the syntax of CREATE INDEX for GIN and GIST. According to
>> http://www.postgresql.org/docs/9.2/static/pgtrgm.html the keyword
>> gist_trgm_ops is also necessary:

> No it's not. The documentation about full-text clearly states that the column needs to be either tsvector or tsquery,
butyou're clearly using text. 

Yeah, Tomas is right: section 12.9 is discussing the core full-text-search
datatypes, which have nothing much to do with contrib/pg_trgm's
facilities.
        regards, tom lane