Github user olarayej commented on the issue:
https://github.com/apache/spark/pull/11336
@felixcheung When a user types a variable name on the R shell, it triggers
method showDefault() which, in turn, invokes show(). I wrote an implementation
of show() for Column which, in turn, invokes head() (not collect), showing the
first 20 elements of the dataset. This mimics R behavior and I think it also
helps with usability. However, if the agreement is not to have that, I can just
remove show method.
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