Map functions
map_from_entries
Constructs a map from an array of key-value pairs.
map_from_entries ( array ) → map
map_from_entries(array[row('key1',1), row('key2',2), row('key3',3)]) -> {key1:1,key2:2,key3:3}
map_from_key_values
Constructs a map from an array of keys and an array of values.
map_from_key_values ( array, array ) → map
map_from_key_values(array['key1','key2','key3'], array[1,2,3]) -> {key1:1,key2:2,key3:3}
map_entries / map_keys / map_values
Returns an array of key-value pairs, keys, or values of the map.
map_entries ( map ) → array
map_keys ( map ) → array
map_values ( map ) → array
map_entries(MAP{1:100,2:200}) -> array[row(1,100),row(2,200)]
map_keys(MAP{1:100,2:200}) -> array[1,2]
map_values(MAP{1:100,2:200}) -> array[100,200]
map_length
Returns the number of key-value pairs in the map.
map_length(MAP{1:100,2:200}) -> 2
map_contains
Returns true if the map contains the given key, false otherwise.
map_contains ( map, key ) → boolean
map_contains(MAP{1:100,2:200}, 1) -> true
map_contains(MAP{1:100,2:200}, 3) -> false
map_access
Returns the value of the map for the given key. Returns null if the key is not found.
map_access ( map, key ) → value
map_access(MAP{1:100,2:200}, 1) -> 100
map_access(MAP{1:100,2:200}, 3) -> null
map_insert
Inserts a key-value pair into the map. If the key is already present, the value is updated.
map_insert ( map, key, value ) → map
map_insert(MAP{1:100,2:200}, 3, 300) -> {1:100,2:200,3:300}
map_insert(MAP{1:100,2:200}, 1, 101) -> {2:200,1:101}
map_delete
Deletes a key-value pair from the map. No-op if the key is not found.
map_delete ( map, key ) → map
map_delete(MAP{1:100,2:200}, 1) -> {2:200}
map_delete(MAP{1:100,2:200}, 3) -> {1:100,2:200}
map_concat
Concatenates two maps. If the same key is present in both maps, the value from the second map is used.
map_cat ( map, map ) → map
map_cat(MAP{1:100,2:200}, MAP{2:201,3:300}) -> {1:100,2:201,3:300}
Map operators
map [key] -> value
Alias of map_access.
MAP{1:100,2:200}[1] → 100
MAP{1:100,2:200}[3] → null
