Support JOIN, PIVOT pipe operators
#17365
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Which issue does this PR close?
Part of #14660
Rationale for this change
Depends on #17312
sqlparser 0.58 released with support for parsing pipe operators.
Let's see if we can make Datafusion support executing them.
What changes are included in this PR?
Support for the following pipe operators
I did not find any support for the pivot operation in Datafusion, so I added an initial implementation. This code could probably be used in a later PR to fix #12907
Are these changes tested?
Yes, I have added SLT tests
Are there any user-facing changes?
Yes, if the dialect is set to one that supports pipe operators, those can then be executed.