Is there a point to having both a normal gist index and an excludeindex? - Mailing list pgsql-general

I am trying to load a database with about 3.5 million records relating
netblocks to locations. I currently don't know whether or not any of the
netblocks overlap. If they don't, then I can simplify queries that
find the locations of IP addresses.

I create the table as follows:
DROP TABLE IF EXISTS iplocation;
  CREATE TABLE iplocation (
  network INET NOT NULL,
  geoname_id INT,
  registered_country_geoname_id INT,
  represented_country_geoname_id INT,
  is_anonymous_proxy BOOLEAN NOT NULL,
  is_satellite_provider BOOLEAN NOT NULL,
  postal_code TEXT,
  latitude DOUBLE PRECISION,
  longitude DOUBLE PRECISION,
  accuracy_radius DOUBLE PRECISION
);

Then I load the table with /copy.

Then I create both a normal gist index and an exclude index using the
following:
DROP INDEX IF EXISTS contains;
CREATE INDEX contains ON iplocation USING gist (network inet_ops);
ANALYZE VERBOSE iplocation;
ALTER TABLE iplocation
  ADD CONSTRAINT overlap EXCLUDE USING gist (network inet_ops WITH &&)
;

So far the exclude index hasn't finished being created.

But I am wondering if it is useful to have the normal gist index for
finding netblocks containing a specific IP address, as it seems like the
exclude index should be usable for that as well.