mike-tr-adamson commented on code in PR #2943:
URL: https://github.com/apache/cassandra/pull/2943#discussion_r1410959123


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src/java/org/apache/cassandra/index/sai/disk/v1/WidePrimaryKeyMap.java:
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@@ -166,10 +177,7 @@ private Clustering<?> readClusteringKey(long sstableRowId)
     // Returns the rowId of the next partition or the number of rows if 
supplied rowId is in the last partition
     private long startOfNextPartition(long rowId)
     {
-        long partitionId = partitionArray.get(rowId);
-        long nextPartitionRowId = partitionArray.indexOf(++partitionId);
-        if (nextPartitionRowId == -1)
-            nextPartitionRowId = partitionArray.length();
-        return nextPartitionRowId;
+        long partitionSize = partitionSizeArray.get(partitionArray.get(rowId));

Review Comment:
   As above, I have changed all the variable names in these classes to make it 
clearer who is doing what.
   
   As an aside, I found that locally `MonotonicBlockPackedReader.indexOf` is 
marked as unsupported. I think we missed that when the `indexOf` was put back 
in. This was causing the final issue we were having, which is why this 
component was added. I have also now marked that method as unsupported.



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