Execution example::

  > table_create --name GeoIndex --flags TABLE_PAT_KEY --key_type WGS84GeoPoint
  [[0,1317212840.20962,0.088534001],true]
  > column_create --table GeoIndex --name index_point --type Site --flags COLUMN_INDEX --source location
  [[0,1317212840.49869,0.093704431],true]
  > load --table Site
  > [
  >  {"_key":"http://example.org/","location":"128452975x503157902"},
  >  {"_key":"http://example.net/","location":"128487316x502920929"}
  > ]
  [[0,1317212840.79332,0.801438285],2]
  > select --table Site --filter 'geo_in_circle(location, "128515259x503187188", 5000)' --output_columns _key,location
  [[0,1317212841.79563,0.000626003],[[[1],[["_key","ShortText"],["location","WGS84GeoPoint"]],["http://example.org/","128452975x503157902"]]]]