presto-parser/src/main/java/io/prestosql/sql/tree/QualifiedName.java/QualifiedName/QualifiedName
class QualifiedName:    private QualifiedName(List<Identifier> originalParts)
    {
        this.originalParts = originalParts;
        this.parts = originalParts.stream().map(identifier -> identifier.getValue().toLowerCase(ENGLISH)).collect(toImmutableList());
    }