sl255051 opened a new issue, #10668:
URL: https://github.com/apache/iceberg/issues/10668

   ### Apache Iceberg version
   
   None
   
   ### Query engine
   
   None
   
   ### Please describe the bug 🐞
   
   PartitionSpec.Builder can only build a partition spec when column names 
match in a case-sensitive way.
   
   I've written a unit test (included below) that reproduces the issue. You can 
add this unit test to the TestPartitionSpecInfo class. The test fails at 
`PartitionSpec.builderFor(schema).identity("DATA")` because the schema's column 
is defined with the name "data" but the builder is looking for "DATA".
   
   ```
     @TestTemplate
     public void testSpecInfoPartitionedTableCaseInsensitive() {
       PartitionSpec spec = 
PartitionSpec.builderFor(schema).identity("DATA").build();
       TestTables.TestTable table = TestTables.create(tableDir, "test", schema, 
spec, formatVersion);
   
       assertThat(table.spec()).isEqualTo(spec);
       
assertThat(table.spec().lastAssignedFieldId()).isEqualTo(spec.lastAssignedFieldId());
       assertThat(table.specs())
               .containsExactly(entry(spec.specId(), spec))
               .doesNotContainKey(Integer.MAX_VALUE);
     }
   ```
   


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