presto-main/src/main/java/io/prestosql/sql/planner/plan/CorrelatedJoinNode.java/Type/typeConvert
class Type:        public static Type typeConvert(Join.Type joinType)
        {
            switch (joinType) {
                case CROSS:
                case IMPLICIT:
                case INNER:
                    return Type.INNER;
                case LEFT:
                    return Type.LEFT;
                case RIGHT:
                    return Type.RIGHT;
                case FULL:
                    return Type.FULL;
                default:
                    throw new UnsupportedOperationException("Unsupported join type: " + joinType);
            }
        }