nizhikov commented on code in PR #11613:
URL: https://github.com/apache/ignite/pull/11613#discussion_r1816116839
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modules/indexing/src/main/java/org/apache/ignite/internal/processors/query/h2/twostep/AbstractReducer.java:
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@@ -319,20 +320,23 @@ protected final ReduceResultPage
createDummyLastPage(ReduceResultPage lastPage)
* @param iter Current iterator.
* @return The same or new iterator.
*/
- protected final Iterator<Value[]>
pollNextIterator(Pollable<ReduceResultPage> queue, Iterator<Value[]> iter) {
- if (!iter.hasNext()) {
+ protected final IgniteIntObjectTuple<Iterator<Value[]>> pollNextIterator(
+ Pollable<ReduceResultPage> queue,
+ IgniteIntObjectTuple<Iterator<Value[]>> iter
+ ) {
+ if (!iter.get2().hasNext()) {
try (TraceSurroundings ignored =
MTC.support(ctx.tracing().create(SQL_PAGE_FETCH, MTC.span()))) {
ReduceResultPage page = takeNextPage(queue);
if (!page.isLast())
page.fetchNextPage(); // Failed will throw an exception
here.
- iter = page.rows();
+ iter = F.intt(page.columnCount(), page.rows());
Review Comment:
In the case of distributed query - empty page can be received from some node
(columnCount == 0) and the other page with requested column count will be
recieved afterwards
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