Qs on Dataset API -- groups of createXXXTempViews and XXXcheckpoint methods

[Jacek Laskowski <ja...@japila.pl>]

Hi,

I'd appreciate your help on the following two questions about Dataset API:

1. Why do Dataset methods:
createTempView, createOrReplaceTempView, createGlobalTempView
and createOrReplaceGlobalTempView not return a DataFrame? They seem to be
neither actions nor transformations (and probably the reason for a separate
group basic). I wonder why they don't return a DataFrame? Where's the catch?

2. Why are localCheckpoint and checkpoint in the basic group? They'd be
fine to be with untyped transformations since they do transform a Dataset
into a DataFrame. Again, a bit of help would be very helpful.

Pozdrawiam,
Jacek Laskowski
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