release-21.2: opt: fix internal error due to node with MaxCost added to memo #84381
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Backport 1/1 commits from #84366.
/cc @cockroachdb/release
Release justification: Fixes an internal error during optimization
This commit fixes an internal error caused by calculating the
selectivity of a join as NaN. The solution is to avoid dividing by
0 when calculating the selectivity.
Fixes #84236
Release note (bug fix): Fixed an internal error "node ... with
MaxCost added to the memo" that could occur during planning when
calculating the cardinality of an outer join when one of the inputs
had 0 rows.