sl255051 commented on code in PR #10678:
URL: https://github.com/apache/iceberg/pull/10678#discussion_r1701214301


##########
api/src/main/java/org/apache/iceberg/PartitionSpec.java:
##########
@@ -442,9 +456,10 @@ private Types.NestedField findSourceColumn(String 
sourceName) {
     Builder identity(String sourceName, String targetName) {
       Types.NestedField sourceColumn = findSourceColumn(sourceName);
       checkAndAddPartitionName(targetName, sourceColumn.fieldId());
+      String normalizedTargetName = caseSensitive ? targetName : 
targetName.toLowerCase();

Review Comment:
   I assume you meant this. The two salient differences are 
   
   1. adding `public` to `Builder identity(String sourceName)`
   2. changing `sourceColumn` type from `String` to `Types.NestedField` in 
`private Builder identity(String sourceColumn, String targetName))`
   
   
   ```Java
       Builder identity(String sourceName, String targetName) {
         return identity(findSourceColumn(sourceName), targetName);
       }
   
       public Builder identity(String sourceName) {
         Types.NestedField sourceColumn = findSourceColumn(sourceName);
         return identity(sourceColumn, sourceColumn.name());
       }
   
       private Builder identity(Types.NestedField sourceColumn, String 
targetName) {
         checkAndAddPartitionName(targetName, sourceColumn.fieldId());
         PartitionField field =
                 new PartitionField(
                         sourceColumn.fieldId(), nextFieldId(), targetName, 
Transforms.identity());
         checkForRedundantPartitions(field);
         fields.add(field);
         return this;
       }
   ```
   



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