rdblue commented on issue #619: Add schema validator URL: https://github.com/apache/incubator-iceberg/pull/619#issuecomment-552047058 I think this is actually easier to implement than the version here. Instead of running a new validator class, I think you can add this validation to the existing `IndexByName` class. Just change `addField` to include the validation: ```java private void addField(String name, int fieldId) { String fullName = name; if (!fieldNames().isEmpty()) { fullName = DOT.join(DOT.join(fieldNames().descendingIterator()), name); } Integer existingFieldId = nameToId.put(fullName, fieldId); if (existingFieldId != null) { throw new ValidationException( "Invalid schema: multiple fields for name %s: %s and %s", fullName, existingFieldId, fieldId); } } ``` Then all you'd need to do is to access `lazyNameToId()` in the constructor.
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