zstan commented on a change in pull request #9751:
URL: https://github.com/apache/ignite/pull/9751#discussion_r791721255



##########
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`m not debate about context switching, we on the same side here, i 
talking about concurrent overall throughput here.




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