Re: Composite GiST indexes?

>>Is it possible to make a composite GiST index?  I want to create an 
>>index on a txtidx and a timestamp column - is that at all possible?

OK, this is what I'm trying (7.3.4):

create index blah on forums_posts using gist(ftiidx, datetime);

ERROR:  data type timestamp with time zone has no default operator class 
for access method "gist"        You must specify an operator class for the index or define a        default operator
classfor the data type
 

I guess I can put an ops indicator in there, but I have no idea what to 
try using...

Chris