presto-main/src/main/java/io/prestosql/sql/analyzer/TypeSignatureTranslator.java/TypeSignatureTranslator/canonicalize
class TypeSignatureTranslator:    private static String canonicalize(Identifier identifier)
    {
        if (identifier.isDelimited()) {
            return identifier.getValue();
        }

        return identifier.getValue().toLowerCase(Locale.ENGLISH); // TODO: make this toUpperCase to match standard SQL semantics
    }