Minor: Add docstrings to UnionExec #4884
Merged
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Which issue does this PR close?
re #4883
Rationale for this change
I was working on #4883 and had to remind myself of how UnionExec worked by reading the code. I figured I would add some docs to help my future self as well as others
What changes are included in this PR?
docstrings and ascii art about union
Are these changes tested?
N/A
Are there any user-facing changes?
Docs