Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/11336
one thing to highlight, previously we discussed a proposal to display a
subset of values for a variable, such as when typing in the variable name in R
shell or RStudio
```
> a <- iris
> a
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4 0.2 setosa
2 4.9 3.0 1.4 0.2 setosa
3 4.7 3.2 1.3 0.2 setosa
```
This PR includes a change to how Column is presented in this case,
before
```
> a <- as.DataFrame(iris)
> a
SparkDataFrame[Sepal_Length:double, Sepal_Width:double,
Petal_Length:double, Petal_Width:double, Species:string]
> a$Sepal_Length
Column Sepal_Length
```
after
```
> a$Sepal.Length
[1] 5.1 4.9 4.7 4.6 5.0 5.4 4.6 5.0 4.4 4.9 5.4 4.8 4.8 4.3 5.8 5.7 5.4
5.1
[19] 5.7 5.1 5.4 5.1 4.6 5.1 4.8 5.0 5.0 5.2 5.2 4.7 4.8 5.4 5.2 5.5 4.9
5.0
```
So instead of type and name we would be doing a collect.
In the earlier discussion, it was concluded that we would not be doing this
without an explicit method call (like `head(col)`), unless, perhaps when the
data frame is local.
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