sl255051 commented on code in PR #10678:
URL: https://github.com/apache/iceberg/pull/10678#discussion_r1700986212


##########
api/src/main/java/org/apache/iceberg/PartitionSpec.java:
##########
@@ -427,13 +429,21 @@ private void checkForRedundantPartitions(PartitionField 
field) {
       dedupFields.put(dedupKey, field);
     }
 
+    public Builder caseSensitive(boolean sensitive) {
+      this.caseSensitive = sensitive;
+      return this;
+    }
+
     public Builder withSpecId(int newSpecId) {
       this.specId = newSpecId;
       return this;
     }
 
     private Types.NestedField findSourceColumn(String sourceName) {
-      Types.NestedField sourceColumn = schema.findField(sourceName);
+      Types.NestedField sourceColumn =
+          this.caseSensitive
+              ? schema.findField(sourceName)
+              : schema.caseInsensitiveFindField(sourceName);

Review Comment:
   I updated the code to use `ImmutableMap.Builder`. It will now throw on 
duplicate keys. It still returns a RegularImmutableMap instance



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