There's an unnecessary non-ASCII Unicode character here:

  List<UUID> getUuidList(String columnNameÏ);

https://github.com/googleapis/java-spanner/blame/4f63109077cb7317eb18d074837b6d1c832f9420/google-cloud-spanner/src/main/java/com/google/cloud/spanner/StructReader.java#L651

This is discouraged by https://errorprone.info/bugpattern/UnicodeInCode

It looks like the character might have been a typo.