There is a partial match between the outer row (NULL, 'c') and the inner row ('v', null). Therefore the correct result of the IN predicate is NULL, and the strategy that produces an incorrect result is partial_match_rowid_merge.
There is a partial match between the outer row (NULL, 'c') and the inner row ('v', null). match_rowid_ merge.
Therefore the correct result of the IN predicate is NULL, and the strategy that produces
an incorrect result is partial_