presto-main/src/main/java/io/prestosql/metadata/BoundVariables.java/BoundVariables/BoundVariables
class BoundVariables:    @JsonCreator
    public BoundVariables(
            @JsonProperty("typeVariables") Map<String, Type> typeVariables,
            @JsonProperty("longVariables") Map<String, Long> longVariables)
    {
        requireNonNull(typeVariables, "typeVariableBindings is null");
        requireNonNull(longVariables, "longVariableBindings is null");
        this.typeVariables = ImmutableMap.copyOf(typeVariables);
        this.longVariables = ImmutableMap.copyOf(longVariables);
    }