[jira] [Created] (SPARK-16467) After importing R data.frame, although DataFrame columns show . replaced by _, the describe() function gives warnings on . in the name

["Neil Dewar (JIRA)" <ji...@apache.org>]

Neil Dewar created SPARK-16467:
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             Summary: After importing R data.frame, although DataFrame columns show . replaced by _,  the describe() function gives warnings on . in the name
                 Key: SPARK-16467
                 URL: https://issues.apache.org/jira/browse/SPARK-16467
             Project: Spark
          Issue Type: Bug
          Components: SparkR
    Affects Versions: 1.6.1
            Reporter: Neil Dewar
            Priority: Minor


When importing an R data.frame into a Spark DataFrame using createDataFrame(), if the R data.frame column names contain period characters "." they are converted to underscores "_".    Most SparkR functions then display the column names with the underscores.  

If the describe() function is used, with the option for a specific function name, warning messages are displayed about the use of period characters.

Example:
sdfIris <- createDataFrame(sqlContext, iris)
str(sdfIris) # works fine
collect(describe(sdfIris, Species))

the last function above throws a string of warnings such as:
1: In FUN(X[[i]], ...) :  Use Sepal_Length instead of Sepal.Length  as column name

Note, the describe() function appears to work ok if no column name is specified but fails if a column name is specified, even if the specified name did not contain a period.



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