rdblue commented on a change in pull request #3148:
URL: https://github.com/apache/iceberg/pull/3148#discussion_r711821316
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File path:
arrow/src/test/java/org/apache/iceberg/arrow/vectorized/ArrowReaderTest.java
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@@ -353,6 +371,29 @@ private void readAndCheckArrowResult(
assertEquals(expectedTotalRows, totalRows);
}
+ private void readAndCheckHasNextIsIdempotent(
+ TableScan scan,
+ int numRowsPerRoot,
+ int expectedTotalRows,
+ int numExtraCallsToHasNext) throws IOException {
+ int totalRows = 0;
+ try (VectorizedTableScanIterable itr = new
VectorizedTableScanIterable(scan, numRowsPerRoot, false)) {
+ CloseableIterator<ColumnarBatch> iterator = itr.iterator();
+ while (iterator.hasNext()) {
+ // Call hasNext() a few extra times.
+ // This should not affect the total number of rows read.
+ for (int i = 0; i < numExtraCallsToHasNext; i++) {
+ assertTrue(iterator.hasNext());
+ }
+
+ ColumnarBatch batch = iterator.next();
+ VectorSchemaRoot root = batch.createVectorSchemaRootFromVectors();
+ totalRows += root.getRowCount();
Review comment:
How does this test that the iterator is idempotent? It looks like this
just tests that the batch size is correct. I think that this should also call
`checkAllVectorValues` to ensure that the expected rows are the ones produced
rather than relying on the total number of rows.
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