Ferdinanddb commented on issue #14091:
URL: https://github.com/apache/iceberg/issues/14091#issuecomment-3306861664

   Thanks for the useful recommendation @RussellSpitzer, I will try to change 
that and implement a unit test for this.
   
   In the mean time, for anyone experiencing this bug, I was able to fix by 
having
   ```java
       } else if (type instanceof DateType) {
         return longToOrderedBytesUDF()
             
.apply(org.apache.spark.sql.functions.unix_date(column).cast(DataTypes.LongType));
       } 
   ```
   
   in this file: 
https://github.com/apache/iceberg/blob/7eef46da0d00edb79b20d24cb7806f6ea8da4000/spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/actions/SparkZOrderUDF.java#L312-L314


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