Qusetion: when trino in 'retry-policy: task' fte mode , why some independent DAG's stage can't parellel?

[2686550621]

for example, a sql : select * from "x1,x2,x3,x4", x1~x4 is independent, they can surely be excuted in the same time, but when there is only one trino worker using fte mode "retry-policy: task", the timeline must be x1->x2->x3->x4->sum up

when the worker without retrypolicy, x1~x4 can be parallel.

[2686550621]

when worker's number grow to 2 or 3..., it can be x1x2x3x4, but sometimes it just x1x2 -> x3x4, (timeline)