Implement map_keys() and map_values() UDFs
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Key: HIVE-1734
URL: https://issues.apache.org/jira/browse/HIVE-1734
Project: Hive
Issue Type: New Feature
Components: UDF
Reporter: Carl Steinbach
Implement the following UDFs:
<array> map_keys(<map>)
and
<array> map_values(<map>)
map_keys() takes a map as input and returns an array consisting of the key
values in the supplied map.
Similarly, map_values() takes a map as input and returns an array containing
the map value fields.
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