presto-main/src/main/java/io/prestosql/operator/StageExecutionDescriptor.java/StageExecutionDescriptor/jsonCreator
class StageExecutionDescriptor:    @JsonCreator
    public static StageExecutionDescriptor jsonCreator(
            @JsonProperty("strategy") StageExecutionStrategy strategy,
            @JsonProperty("groupedExecutionScanNodes") Set<PlanNodeId> groupedExecutionCapableScanNodes)
    {
        return new StageExecutionDescriptor(
                requireNonNull(strategy, "strategy is null"),
                ImmutableSet.copyOf(requireNonNull(groupedExecutionCapableScanNodes, "groupedExecutionScanNodes is null")));
    }