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"GroupAggregate  (cost=265935.63..285867.54 rows=137462 width=26)"
"  Filter: (count(*) > 1)"
"  ->  Sort  (cost=265935.63..269372.16 rows=1374614 width=26)"
"        Sort Key: latitude_decimal, longitude_decimal"
"        ->  Seq Scan on temp_city  (cost=0.00..27121.14 rows=1374614 width=26)"