Returns the union of all the given maps. If a key is found in multiple given maps, that key’s value in the resulting map comes from the last one of those maps.Supported Signatures
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function map_concat(map<$4, $5>, ...) returns map<$4, $5>
Merges the two given maps into a single map by applying function to the pair of values with the same key. For keys only presented in one map, NULL will be passed as the value for the missing key.Supported Signatures