[FEA] Enable dynamic "has_nulls" for row operators

[jrhemstad]

Is your feature request related to a problem? Please describe.

The row_lexicographic_comparator and row_equality_comparator have a has_nulls non-type template parameter to allow optimizing away the more expensive null handling code.

While this is nice in cases where the null logic actually impacts performance, there are times where it doesn't. In the cases where it doesn't matter for performance, it needlessly increases compile time by having two versions of a kernel (has_nulls==true and has_nulls==false).

We should make it so this information can be dynamic in addition to static.

Describe the solution you'd like

Similar to optional_iterator change the has_nulls to have three options:

row_equality_comparator<HAS_NULLS::YES>{...}
row_equality_comparator<HAS_NULLS::NO>{...}
row_equality_comparator<HAS_NULLS::DYNAMIC>{..., has_nulls}; // runtime value for has_nulls

The implementation should be specialized to ignore the has_nulls dynamic value for the two static cases.

[davidwendt]

I had already started looking at an approach for this awhile back. Summary of my findings are in #6952

[github-actions]

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[davidwendt]

Closed by #9623