Re: Could regexp_matches be immutable?

David Fetter <david@fetter.org> wrote:
> On Wed, Oct 14, 2009 at 04:51:03PM -0400, Tom Lane wrote:
>> Rod Taylor <rod.taylor@gmail.com> writes:
>> > I tried making a functional index based on an expression
>> > containing the 2 argument regexp_matches() function. Is there a
>> > reason why this function is not marked immutable instead of
>> > normal?
>> 
>> regex_flavor affects its result.
> 
> Speaking of which, can we see about deprecating and removing this
> GUC?
+1  It would seem to me to be more valuable to have the benefits of
IMMUTABLE than preserve pre-7.4 compatibility forever.
-Kevin