presto-main/src/main/java/io/prestosql/operator/annotations/TypeImplementationDependency.java/TypeImplementationDependency/TypeImplementationDependency
class TypeImplementationDependency:    public TypeImplementationDependency(String signature)
    {
        this.signature = parseTypeSignature(requireNonNull(signature, "signature is null"), ImmutableSet.of());
    }