YQ-2873 fix hanging in kqp compute actor (#2131)

Author: GrigoriyPA

ydb/core/kqp/compute_actor/kqp_pure_compute_actor.cpp

@@ -148,6 +148,11 @@ ui64 TKqpComputeActor::CalcMkqlMemoryLimit() {
     return TBase::CalcMkqlMemoryLimit() + ComputeCtx.GetTableScans().size() * MemoryLimits.ChannelBufferSize;
 }
 
+void TKqpComputeActor::CheckRunStatus() {
+    ProcessOutputsState.LastPopReturnedNoData = !ProcessOutputsState.DataWasSent;
+    TBase::CheckRunStatus();
+}
+
 void TKqpComputeActor::FillExtraStats(NDqProto::TDqComputeActorStats* dst, bool last) {
     if (last && SysViewActorId && ScanData && dst->TasksSize() > 0) {
         YQL_ENSURE(dst->TasksSize() == 1);

ydb/core/kqp/compute_actor/kqp_pure_compute_actor.h

@@ -38,6 +38,8 @@ class TKqpComputeActor : public TDqSyncComputeActorBase<TKqpComputeActor> {
 protected:
     ui64 CalcMkqlMemoryLimit() override;
 
+    void CheckRunStatus() override;
+
 public:
     void FillExtraStats(NDqProto::TDqComputeActorStats* dst, bool last);