ContinueExecute on non-empty transform (backport #12201) (#12450)

Author: yumkam

ydb/library/yql/dq/actors/compute/dq_compute_actor_impl.h

@@ -439,6 +439,14 @@ class TDqComputeActorBase : public NActors::TActorBootstrapped<TDerived>
             return;
         }
 
+        if (status != ERunStatus::Finished) {
+            for (auto& [id, inputTransform] : InputTransformsMap) {
+                if (!inputTransform.Buffer->Empty()) {
+                    ContinueExecute(EResumeSource::CAPendingInput);
+                }
+            }
+        }
+
         if (status != ERunStatus::Finished) {
             // If the incoming channel's buffer was full at the moment when last ChannelDataAck event had been sent,
             // there will be no attempts to send a new piece of data from the other side of this channel.