stats.sql

select _postgis_stats('tm_world_borders_s_11'::regclass ,'the_geom');
-[ RECORD 1 ]--+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_postgis_stats | {"ndims":2,"size":[6,7],"extent":{"min":[-181.8,-90.8679],"max":[181.8,84.4381]},"table_features":246,"sample_features":246,"not_null_features":246,"histogram_features":246,"histogram_cells":42,"cells_covered":246}