RussellSpitzer commented on code in PR #10943:
URL: https://github.com/apache/iceberg/pull/10943#discussion_r1719058057


##########
arrow/src/main/java/org/apache/iceberg/arrow/vectorized/parquet/VectorizedColumnIterator.java:
##########
@@ -69,12 +69,14 @@ public boolean producesDictionaryEncodedVector() {
   }
 
   public abstract class BatchReader {
-    public void nextBatch(FieldVector fieldVector, int typeWidth, 
NullabilityHolder holder) {
+    public void nextBatch(
+        int numValsToRead, FieldVector fieldVector, int typeWidth, 
NullabilityHolder holder) {
       int rowsReadSoFar = 0;
-      while (rowsReadSoFar < batchSize && hasNext()) {
+      while (rowsReadSoFar < batchSize && hasNext() && rowsReadSoFar < 
numValsToRead) {
         advance();
+        int expectedBatchSize = Math.min(batchSize - rowsReadSoFar, 
numValsToRead - rowsReadSoFar);

Review Comment:
   We definitely need to guard num_vals to read here to be greater than -1, we 
still have the potential for overflow but probably not huge if we require -1 as 
the only negative value allowed



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