列表运算符

Nebula Graph支持使用列表（List）运算符进行运算。支持的运算符如下。

名称说明
+连接列表。
IN元素是否存在于列表中。
[]使用下标操作符访问列表中的元素。

示例

  1. nebula> YIELD [1,2,3,4,5]+[6,7] AS myList;
  2. +-----------------------+
  3. | myList                |
  4. +-----------------------+
  5. | [1, 2, 3, 4, 5, 6, 7] |
  6. +-----------------------+
  8. nebula> RETURN size([NULL, 1, 2]);
  9. +------------------+
  10. | size([NULL,1,2]) |
  11. +------------------+
  12. | 3                |
  13. +------------------+
  15. nebula> RETURN NULL IN [NULL, 1];
  16. +--------------------+
  17. | (NULL IN [NULL,1]) |
  18. +--------------------+
  19. | __NULL__           |
  20. +--------------------+
  22. nebula> WITH [2, 3, 4, 5] AS numberlist \
  23.     UNWIND numberlist AS number \
  24.     WITH number \
  25.     WHERE number IN [2, 3, 8] \
  26.     RETURN number;
  27. +--------+
  28. | number |
  29. +--------+
  30. | 2      |
  31. +--------+
  32. | 3      |
  33. +--------+
  35. nebula> WITH ['Anne', 'John', 'Bill', 'Diane', 'Eve'] AS names RETURN names[1] AS result;
  36. +--------+
  37. | result |
  38. +--------+
  39. | "John" |
  40. +--------+