presto-main/src/main/java/io/prestosql/execution/scheduler/NodeSchedulerConfig.java/NodeSchedulerConfig/setMaxPendingSplitsPerTask
class NodeSchedulerConfig:    @Config("node-scheduler.max-pending-splits-per-task")
    @LegacyConfig({"node-scheduler.max-pending-splits-per-node-per-task", "node-scheduler.max-pending-splits-per-node-per-stage"})
    public NodeSchedulerConfig setMaxPendingSplitsPerTask(int maxPendingSplitsPerTask)
    {
        this.maxPendingSplitsPerTask = maxPendingSplitsPerTask;
        return this;
    }