How did you optimize geofiltering search queries in PostgreSQL? What helped you optimize them?

Optimizing geofiltered search queries in PostgreSQL typically involves using spatial indexes and proper query construction.

Main steps:

1. Use the PostGIS extension for working with geospatial data.
2. Create GiST or SP-GiST indexes on geometric columns, for example:

CREATE INDEX idx_location ON places USING GIST(geom);

3. Use PostGIS functions in queries that efficiently utilize indexes, such as ST_DWithin for finding objects within a radius:

SELECT * FROM places WHERE ST_DWithin(geom, ST_MakePoint(lon, lat)::geography, radius);

4. Avoid functions that do not use indexes, such as ST_Distance without filtering.

5. Cache results and limit the selection (LIMIT) if necessary.

As a result, query execution time can be significantly reduced by using spatial indexes and proper PostGIS functions.