presto-main/src/main/java/io/prestosql/sql/planner/plan/UnnestNode.java/UnnestNode/UnnestNode
class UnnestNode:    @JsonCreator
    public UnnestNode(
            @JsonProperty("id") PlanNodeId id,
            @JsonProperty("source") PlanNode source,
            @JsonProperty("replicateSymbols") List<Symbol> replicateSymbols,
            @JsonProperty("unnestSymbols") Map<Symbol, List<Symbol>> unnestSymbols,
            @JsonProperty("ordinalitySymbol") Optional<Symbol> ordinalitySymbol,
            @JsonProperty("joinType") Type joinType,
            @JsonProperty("filter") Optional<Expression> filter)
    {
        super(id);
        this.source = requireNonNull(source, "source is null");
        this.replicateSymbols = ImmutableList.copyOf(requireNonNull(replicateSymbols, "replicateSymbols is null"));
        checkArgument(source.getOutputSymbols().containsAll(replicateSymbols), "Source does not contain all replicateSymbols");
        requireNonNull(unnestSymbols, "unnestSymbols is null");
        checkArgument(!unnestSymbols.isEmpty(), "unnestSymbols is empty");
        ImmutableMap.Builder<Symbol, List<Symbol>> builder = ImmutableMap.builder();
        for (Map.Entry<Symbol, List<Symbol>> entry : unnestSymbols.entrySet()) {
            builder.put(entry.getKey(), ImmutableList.copyOf(entry.getValue()));
        }
        this.unnestSymbols = builder.build();
        this.ordinalitySymbol = requireNonNull(ordinalitySymbol, "ordinalitySymbol is null");
        this.joinType = requireNonNull(joinType, "type is null");
        this.filter = requireNonNull(filter, "filter is null");
    }