On 30/8/19 3:42 π.μ., Ken Tanzer wrote:
Hi. Using 9.6.14, I was setting up a table with this:
EXCLUDE using gist (EXCLUDE using gist (grant_number_codes with &&)
Where grant_numbers is a varchar[]. I get this error:
ERROR: data type character varying[] has no default operator class for access method
"gist"
HINT: You must specify an operator class for the index or define a default
operator class for the data type.
I did some Googling, and it looks like you could do this for integer arrays with the intarray extension. I didn't see anything I'd recognize as an equivalent for varchar (or text) arrays. Is there
any way to do this now? And if not, is there much prospect of this being implemented at some point?
I found a couple of old threads about this. Not sure if they are still
relevant, but listed below.
Also, on a side note, I tried using grant_number_codes::text[] with &&, but
that got a syntax error. Does that mean casting isn't allowed at all in these
constraints?
Maybe take a look at
https://dba.stackexchange.com/questions/185174/error-data-type-text-has-no-default-operator-class-for-access-method-gist
Thanks in advance,
Ken
1) This 2014 thread asked about this:
_*array exclusion constraints*_
https://www.postgresql.org/message-id/flat/20141113183843.E8AC620362%40smtp.hushmail.com
and pointed toward this 2013 discussion:
_*Todo item: Support amgettuple() in GIN*_
https://www.postgresql.org/message-id/flat/5297DC17.7000608%40proxel.se
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