presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/TransformCorrelatedInPredicateToJoin.java/TransformCorrelatedInPredicateToJoin/not
class TransformCorrelatedInPredicateToJoin:    private static Expression not(Expression booleanExpression)
    {
        return new NotExpression(booleanExpression);
    }