If key holds a hash, retrieve the value associated to the specified field. <p> If the field is not found or the key does not exist, a special 'nil' value is returned. <p> <b>Time complexity:</b> O(1) @param key @param field @return Bulk reply
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If key holds a hash, retrieve the value associated to the specified field. <p> If the field is not found or the key does not exist, a special 'nil' value is returned. <p> <b>Time complexity:</b> O(1) @param key @param field @return Bulk reply