Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14629
Interesting point, yeah, because normally in an RDBMS you have to
`COUNT(*)` or `COUNT(1)` and the argument is useless anyway, so would be nice
to not have to provide an argument to select in this context. But while
comparing to `DataFrame`s, of course you should already `count()` directly if
this is desired.
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