Github user adrian555 commented on the pull request:
https://github.com/apache/spark/pull/9031#issuecomment-147096207
@sun-rui First, the current subsetting function '$' of DataFrame ends up
with a 'Column' class instead of a real column access of 'DataFrame'. So to
operate on one column of a DataFrame, in SparkR, you will have to use df[,
"columnName"] instead.
Second, the major reason of using attach() is to access the columns of a
DataFrame directly by adding the column name to the search list for R so that R
can find it just by its name. We see customers using this in their scripts
often. If SparkR has this too, it will make SparkR more R friendly.
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