riemenschneider opened a new issue, #13696:
URL: https://github.com/apache/iceberg/issues/13696
### Apache Iceberg version
1.9.2 (latest release)
### Query engine
None
### Please describe the bug 🐞
When creating an `UpdateSchema` and configuring case-insensitive comparison
of column names, as well as adding multiple columns that differ only in the
case of their names, the schema update will not fail as expected.
```
table.updateSchema()
.caseSensitive(false)
.addColumn("column", Types.IntegerType.get())
.addColumn("COLUMN", Types.IntegerType.get())
.commit();
```
The issue originates from the final validation step when committing the
`UpdateSchema`, which ignores the case sensitivity setting.
### Willingness to contribute
- [ ] I can contribute a fix for this bug independently
- [x] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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