[jira] [Created] (SPARK-19773) SparkDataFrame should not allow duplicate names

["Wayne Zhang (JIRA)" <ji...@apache.org>]

Wayne Zhang created SPARK-19773:
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             Summary: SparkDataFrame should not allow duplicate names
                 Key: SPARK-19773
                 URL: https://issues.apache.org/jira/browse/SPARK-19773
             Project: Spark
          Issue Type: Bug
          Components: SparkR
    Affects Versions: 2.1.0
            Reporter: Wayne Zhang
            Priority: Minor


SparkDataFrame in SparkR seems to accept duplicate names at creation, but incurs error when calling methods downstream. For example, we can do: 
{{{code}}}
l <- list(list(1, 2), list(3, 4))
df <- createDataFrame(l, c("a", "a"))
head(df)
{{{code}}}
But an error occurs when we do df$a = df$a * 2.0. 

I suggest we add validity check for duplicate names at initialization.  




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