Return 语法

    • 为变量名称，示例：$var
    2.         $rA = YIELD $A.* WHERE $A.dst == 201; \
    3.         RETURN $rA IF $rA is NOT NULL; \ /* $rA 为非空，返回 $rA */
    4.         GO FROM $A.dst OVER follow; /* 语句不执行*/
    5. | $A.dst |
    7. | 201    |
    8. ----------
    9. nebula> $A = GO FROM 200 OVER follow YIELD follow._dst AS dst; \
    10.         $rA = YIELD $A.* WHERE $A.dst == 300; \
    12. =============
    13. | follow._dst |
    14. =============
    15. | 200       |
    16. -------------
    17. -------------