findinpath opened a new pull request, #5110:
URL: https://github.com/apache/iceberg/pull/5110

   Address the following scenario:
   
   ```
           onSpark().executeQuery(format(
                   "CREATE TABLE %s (id INTEGER, `mIxEd_COL` STRING) USING 
ICEBERG",
                   sparkTableName));
           assertQueryFailure(() -> onTrino().executeQuery("ALTER TABLE " + 
trinoTableName + " SET PROPERTIES partitioning = ARRAY['mIxEd_COL']"))
                   .hasMessageContaining("Cannot find source column: mixed_col);
   ```
   
   Trino lowercases internally the identifiers for the column names.
   
   This PR attempts to provide a transparent fashion to allow building a 
`PartitionSpec` by specifying the source column names in a case insensitive 
fashion.
   


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