GO FROM 'dataset1' OVER edge1
YIELD $^ as source, id($^) as sourceId, id($$) as targetId
| GO FROM $-.targetId OVER edge2
YIELD $-.source as source, $$ as target
只查询 step1、step2 的子图
GO 1 TO 2 STEPS FROM 'dataset1' OVER edge1
YIELD $^ as source, id($^) as sourceId, id($$) as targetId
| GO FROM $-.targetId OVER edge2
YIELD $-.source as source, $$ as target