zstan commented on a change in pull request #9751:
URL: https://github.com/apache/ignite/pull/9751#discussion_r794261313



##########
File path: 
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/exec/rel/ScanNode.java
##########
@@ -58,8 +60,20 @@ public ScanNode(ExecutionContext<Row> ctx, RelDataType 
rowType, Iterable<Row> sr
 
         requested = rowsCnt;
 
-        if (!inLoop)
-            context().execute(this::push, this::onError);
+        if (!inLoop) {
+            if (firstReq) {

Review comment:
       I really don`t know i just suppose, seems we need some kind of yardstick 
tests here, if you have no possibility to run them let's leave it as it is.




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