presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/ReorderJoins.java/MultiJoinNode/toMultiJoinNode
class MultiJoinNode:            MultiJoinNode toMultiJoinNode()
            {
                return new MultiJoinNode(sources, and(filters), outputSymbols, pushedProjectionThroughJoin);
            }