the mongo storage handler for the hive
##CAUSION:
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currently only support Hive primitive types: string, int, smallint....
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Whitespace should not be used in between entries in the "mongo.columns.mapping" string, since these will be interperted as part of the column name, which is not what you want.
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if you want "insert overwrite" feature, you must have a field named be mapped to "_id" field (Object Id in MongoDB collections).