reduce函数

    1. nebula> RETURN reduce(totalNum = 10, n IN range(1, 3) | totalNum + n) AS r;
    2. +----+
    3. | r  |
    4. +----+
    5. | 16 |
    6. +----+
    8. nebula> RETURN reduce(totalNum = -4 * 5, n IN [1, 2] | totalNum + n * 2) AS r;
    10. | r   |
    11. | -14 |
    12. +-----+
    14. nebula> MATCH p = (n:player{name:"LeBron James"})<-[:follow]-(m) \
    15.         RETURN  nodes(p)[0].age AS src1,  nodes(p)[1].age AS dst2,  \
    16.         reduce(totalAge = 100, n IN nodes(p) | totalAge + n.age) AS sum;
    17. +------+------+-----+
    18. | src1 | dst2 | sum |
    19. +------+------+-----+
    20. | 34   | 31   | 165 |
    21. | 34   | 29   | 163 |
    22. | 34   | 33   | 167 |
    24. | 34   | 37   | 171 |
    25. +------+------+-----+
    27. nebula> LOOKUP ON player WHERE player.name == "Tony Parker" \
    28.         |  GO FROM $-.VertexID over follow \
    29.         WHERE properties(edge).degree != reduce(totalNum = 5, n IN range(1, 3) | properties($$).age + totalNum + n) \
    30.         YIELD properties($$).name AS id, properties($$).age AS age, properties(edge).degree AS degree;
    31. +---------------------+-----+--------+
    32. | id                  | age | degree |
    33. +---------------------+-----+--------+
    34. | "Tim Duncan"        | 42  | 95     |
    35. | "LaMarcus Aldridge" | 33  | 90     |
    36. | "Manu Ginobili"     | 41  | 95     |