pg_trgm Extension Installed but Operators and Functions do not exist

"Igal @ Lucee.org" <igal@lucee.org> writes:

I am trying to run a query which was working a few weeks ago, and it
utilizes the <<-> operator but I am getting an error: operator does not
exist text <<-> text.

If I try instead the function word_similarity() I get a similar (no pun
intended) error: function word_similarity(text, text) does not exist.

If I try to install the pg_trgm extension with `CREATE EXTENSION
pg_trgm;` I get an error: extension "pg_trgm" already exists.

Seems like a likely bet is that the extension is installed in a schema
that isn't in your search_path.

regards, tom lane

On 1/28/2018 12:35 PM, Tom Lane wrote:

"Igal @ Lucee.org" <igal@lucee.org> writes:

I am trying to run a query which was working a few weeks ago, and it
utilizes the <<-> operator but I am getting an error: operator does not
exist text <<-> text.

If I try to install the pg_trgm extension with `CREATE EXTENSION
pg_trgm;` I get an error: extension "pg_trgm" already exists.

Seems like a likely bet is that the extension is installed in a schema
that isn't in your search_path.

Thank you, Tom.  I was unaware of the fact that extensions are installed
to specific schemas.

For future users who might face this issue, I fixed it by re-creating
the extension in the pg_catalog schema, which is always in the
search_path [1]https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SEARCH-PATH:

  DROP EXTENSION pg_trgm;

  CREATE EXTENSION pg_trgm SCHEMA pg_catalog;

Thanks again,

Igal

[1]: https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SEARCH-PATH
https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SEARCH-PATH