Re: v9.1, DROP TRIGGER IF EXISTS behaving oddly

On 01/13/2016 02:24 PM, Tom Lane wrote:
> "Williamson, Michael" <Michael.Williamson@tamucc.edu> writes:
>> I'm attempting to drop a trigger that may or may not exist, so am using
>> the "IF EXISTS" clause. Â This works fine for tables, views, functions,
>> domains, and types, but for some reason seems to be ignored for
>> triggers. Â I'd expect to see more about this online if it were a bug,
>> so I'm thinking I may be missing something obvious.
>
>> Example:
>> DROP TRIGGER IF EXISTS udf_customer_update_trigger ON customer;
>
>> Expected Output:
>> NOTICE:Â Â trigger "udf_customer_update_trigger" does not exist, skipping
>
>> Observed Output:
>> ERROR:Â Â relation "udf_customer_update_trigger" does not exist
>
>> Environment:
>> CentOS 6.6
>> postgresql91-server-9.1.14-1PGDG.rhel6.x86_64
>
> This has worked the way you're imagining since (I think) 9.4.  Before
> that the "if exists" semantics only applied to the trigger itself,
> not to the relation.

Alright now I am confused. Other then changing table to table_name I am
not seeing where the below changed. In both cases a NOTICE is supposed
to be raised.

http://www.postgresql.org/docs/9.1/interactive/sql-droptrigger.html

http://www.postgresql.org/docs/9.4/interactive/sql-droptrigger.html

>
>             regards, tom lane
>
>


--
Adrian Klaver
adrian.klaver@aklaver.com