Github user Tagar commented on the issue:
https://github.com/apache/spark/pull/21187
Would be great to make `FOR` section optional.
E.g. - make `FOR year IN (2012, 2013)` optional in one of your examples.
Currently `pivot()` when called programmatically, doesn't require to have
list of values
defined up-front.
Otherwise it'll be a big inconvenience/limitation in `PIVOT` when called
from SQL.
Notice that Oracle's PIVOT when used on XML doesn't require list of values
either -
https://community.oracle.com/thread/2183084
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