fix panic over SetOps with joins and subqueries
#3145
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The analyzer rule
assignExecIndexeswill apply aStripRowNodeover any joins within a subquery.The analyzer rule
finalizeUnionsrecursively calls the analyzer (callingassignExecIndexes), resulting inStripRowNodes getting applied twice.The double stripping results in rows that are too short and panics.
This PR tells the finalizeUnions selector to skip
assignExecIndexes, preventing the nestedStripRowNodes.Also has some small formatting and naming clean up.
fixes: dolthub/dolt#9631