presto-main/src/main/java/io/prestosql/metadata/ResolvedFunction.java/ResolvedFunction/equals
class ResolvedFunction:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        ResolvedFunction that = (ResolvedFunction) o;
        return Objects.equals(signature, that.signature) &&
                Objects.equals(functionId, that.functionId);
    }