Missing whitespace in SQL generated for PostGIS indexed with USING.

[Hannes Ljungberg]

Creating an index as:

class City(models.Model):
    point = models.PointField(geography=True)

    class Meta:
        index = Index(fields=["point"])

Will generate the valid but not so pretty CREATE INDEX statement:

CREATE INDEX "geogapp_city_point_id" ON "geogapp_city"USING GIST ("point")

The following would be expected:

CREATE INDEX "geogapp_city_point_id" ON "geogapp_city" USING GIST ("point")

[Hannes Ljungberg]

PR: ​https://github.com/django/django/pull/12435

[Mariusz Felisiak <felisiak.mariusz@…>]

In adcf1a73:

Fixed #31248 -- Added missing space before USING SQL on PostGIS.