Yohahaha opened a new issue, #2986:
URL: https://github.com/apache/fluss/issues/2986

   I found a bug while testing reading PK tables, it fails when using the last 
column as the primary key, current cases in SparkPrimaryKeyTableReadTest all 
use first column and partition column as primary key.
   
   ```scala
   test("Spark Read: primary key table with last pk") {
       withTable("t") {
         sql("CREATE TABLE t (id int, name string, pk int, pk2 string) 
TBLPROPERTIES('primary.key'='pk,pk2')")
         checkAnswer(sql("SELECT * FROM t"), Nil)
         sql("INSERT INTO t VALUES (1, 'a', 10, 'x'), (2, 'b', 20, 'y')")
         checkAnswer(sql("SELECT * FROM t ORDER BY id"), Row(1, "a", 10, "x") 
:: Row(2, "b", 20, "y") :: Nil)
       }
     }
   ```
   
   above case will failed with 
   ```
   Job aborted due to stage failure: Task 0 in stage 3.0 failed 1 times, most 
recent failure: Lost task 0.0 in stage 3.0 (TID 4) (192.168.0.116 executor 
driver): java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for 
length 2
        at org.apache.fluss.row.ProjectedRow.getInt(ProjectedRow.java:90)
        at 
org.apache.fluss.row.InternalRow.lambda$createFieldGetter$ff31e09f$6(InternalRow.java:198)
        at 
org.apache.fluss.row.encode.CompactedKeyEncoder.encodeKey(CompactedKeyEncoder.java:83)
        at 
org.apache.fluss.spark.read.FlussUpsertPartitionReader$$anon$1.compare(FlussUpsertPartitionReader.scala:113)
        at 
org.apache.fluss.spark.read.FlussUpsertPartitionReader$$anon$1.compare(FlussUpsertPartitionReader.scala:111)
        at 
org.apache.fluss.spark.utils.LogChangesIterator.hasSamePrimaryKey(LogChangesIterator.scala:117)
        at 
org.apache.fluss.spark.utils.LogChangesIterator.hasNext(LogChangesIterator.scala:85)
        at 
org.apache.fluss.client.table.scanner.SortMergeReader.readBatch(SortMergeReader.java:90)
        at 
org.apache.fluss.spark.read.FlussUpsertPartitionReader.initialize(FlussUpsertPartitionReader.scala:217)
        at 
org.apache.fluss.spark.read.FlussUpsertPartitionReader.<init>(FlussUpsertPartitionReader.scala:86)
        at 
org.apache.fluss.spark.read.FlussUpsertPartitionReaderFactory.createReader(FlussPartitionReaderFactory.scala:61)
   ```
   
   _Originally posted by @Yohahaha in 
https://github.com/apache/fluss/issues/2523#issuecomment-3835480927_
               


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