Nothing
      #--------------------------------
# 'geonear' [ using 'aggregate' ]
query_geonear = list('$geoNear' =
                       list(near =
                              list(
                                type = "Point",
                                coordinates = c(-122.5, 37.1)),
                            distanceField = "distance",
                            maxDistance = 900 * 1609.34,
                            distanceMultiplier = 1 / 1609.34,
                            spherical = TRUE)
                     )
#------------------------------
# 'nearSphere' [ using 'find' ]
query_nearSphere = list('location' =
                          list('$nearSphere' =
                                 list('$geometry' =
                                        list(
                                          type = 'Point',
                                          coordinates = c(-122.5, 37.1)),
                                      '$maxDistance' = 900 * 1609.34)
                               )
                        )
#------------------------------
# 'geoIntersects' [ using 'find' ]
query_geoIntersects = list('location' =
                             list('$geoIntersects' =
                                    list('$geometry' =
                                           list(
                                             type = "Polygon",
                                             coordinates = list(
                                               list(
                                                 c(-109, 41),
                                                 c(-102, 41),
                                                 c(-102, 37),
                                                 c(-109, 37),
                                                 c(-109, 41)
                                                 )
                                               )
                                             )
                                         )
                                  )
                           )
#------------------------------
# 'geoWithin' [ using 'find' ]
query_geoWithin = list('location' =
                         list('$geoWithin' =
                                list('$geometry' =
                                       list(
                                         type = "Polygon",
                                         coordinates = list(
                                           list(
                                             c(-109, 41),
                                             c(-102, 41),
                                             c(-102, 37),
                                             c(-109, 37),
                                             c(-109, 41)
                                             )
                                           )
                                         )
                                     )
                              )
                       )
#------------------------------
# 'geoWithin-centerSphere' [ using 'find' ]
query_geoWithin_sph = list('location' =
                             list('$geoWithin' =
                                    list('$centerSphere' =
                                           list(
                                             c(-122.5, 37.7), 300 / 3963.2)
                                         )
                                  )
                           )
#============================================================= geoqueries based on bulk import : https://docs.mongodb.com/manual/tutorial/geospatial-tutorial/
#---------------neighborhoods
QUER = list('geometry' =
              list('$geoIntersects' =
                     list('$geometry' =
                            list(
                              'type' = 'Point',
                              'coordinates' = c(-73.93414657, 40.82302903)
                              )
                          )
                   )
            )
#---------------- restaurants - geowithin
rest_geowithin = list('location' =
                        list('$geoWithin' =
                               list('$centerSphere' =
                                      list(
                                        c(-73.93414657, 40.82302903 ), 5 / 3963.2 )
                                    )
                             )
                      )
#--------------- restaurants - nearSphere
# returns all restaurants within five miles of the user in sorted order from nearest to farthest
QUER_nearsph = list('location' =
                      list('$nearSphere' =
                             list('$geometry' =
                                    list(
                                      'type' = 'Point',
                                      'coordinates' =
                                        c(-73.93414657, 40.82302903)),
                                  '$maxDistance' = 5 * 1609.34)
                           )
                    )
#--------------------- https://docs.mongodb.com/manual/geospatial-queries/
NESTED = list(list('name' = "Central Park", 'location' =  list('type' = "Point", 'coordinates' = c(-73.97, 40.77)), 'category' = "Parks"),
              list('name' = "Sara D. Roosevelt Park", 'location' =  list('type' = "Point", 'coordinates' = c(-73.9928, 40.7193)), 'category' = "Parks"),
              list('name' = "Polo Grounds", 'location' =  list('type' = "Point", 'coordinates' = c(-73.9375, 40.8303)), 'category' = "Stadiums"))
#--------------------- 'json_schema_validator' function
schema_dict = list("type" = "object",
                   "properties" = list(
                     "name" = list("type" = "string"),
                     "location" = list("type" = "object",
                                       "properties" = list(
                                         "type" = list("enum" = c("Point", "Polygon")),                     # in case that "type" is at the same time also a property name do not include "type" = "string" , https://github.com/epoberezkin/ajv/issues/137
                                         #"type1" = list("type" = "string", "enum" = c("Point", "Polygon")),
                                         "coordinates" = list("type" = "array")
                                       ))))
data_dict = list("name" = "Squaw Valley", "location" = list("type" = "Point", "coordinates" = c(-120.24, 39.21)))
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