presto-main/src/main/java/io/prestosql/sql/planner/plan/FilterNode.java/FilterNode/FilterNode
class FilterNode:    @JsonCreator
    public FilterNode(@JsonProperty("id") PlanNodeId id,
            @JsonProperty("source") PlanNode source,
            @JsonProperty("predicate") Expression predicate)
    {
        super(id);

        this.source = source;
        this.predicate = predicate;
    }