rejectsNullsFor ( attrNames )
Does condition require a non-null value for any named column?
This method is used to determine whether an outer join can be reduced
to a regular join, due to a requirement that an outer-joined column be
non-null. (Note that for rejectsNullsFor() to be true for an or
condition, it must be true for all the 'or'-ed subconditions.)
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