Minor: make unsupported nanosecond
part a real (not internal) error
#13733
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Which issue does this PR close?
Closes #.
Rationale for this change
I noticed this while working on #13732
Extracting nanoseconds from a timestamp is not supported, but currently that is marked as in internal error. Let's make it the proper code (not supported)
What changes are included in this PR?
Changes:
Are these changes tested?
Yes, this change is covered by tests (see updates)
Are there any user-facing changes?
Clearer error message