Miao Wang created SPARK-19616:
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             Summary: weightCol and aggregationDepth should be improved for 
some SparkR APIs 
                 Key: SPARK-19616
                 URL: https://issues.apache.org/jira/browse/SPARK-19616
             Project: Spark
          Issue Type: Improvement
          Components: SparkR
    Affects Versions: 2.1.0, 2.2.0
            Reporter: Miao Wang
            Priority: Minor


When doing SPARK-19456, we found that "" should be consider a NULL column name 
and should not be set. aggregationDepth should be exposed as an expert 
parameter.



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