presto-main/src/main/java/io/prestosql/memory/MemoryPoolAssignment.java/MemoryPoolAssignment/MemoryPoolAssignment
class MemoryPoolAssignment:    @JsonCreator
    public MemoryPoolAssignment(@JsonProperty("queryId") QueryId queryId, @JsonProperty("poolId") MemoryPoolId poolId)
    {
        this.queryId = requireNonNull(queryId, "queryId is null");
        this.poolId = requireNonNull(poolId, "poolId is null");
    }