diff --git a/disk/src/agg/binnedt.rs b/disk/src/agg/binnedt.rs
index 0d5aff6..5ae2403 100644
--- a/disk/src/agg/binnedt.rs
+++ b/disk/src/agg/binnedt.rs
@@ -110,16 +110,23 @@ where
                 k
             } else if self.inp_completed {
                 if self.range_complete {
-                    self.range_complete_emitted = true;
-                    // TODO why can't I declare that type?
-                    //type TT = <I::Aggregator as AggregatorTdim>::OutputValue;
-                    if let Some(k) = <I::Aggregator as AggregatorTdim>::OutputValue::make_range_complete_item() {
-                        return Ready(Some(Ok(k)));
-                    } else {
-                        warn!("IntoBinnedTDefaultStream  should emit RangeComplete but I doesn't have one");
+                    if self.range_complete_emitted {
+                        self.completed = true;
                         Ready(None)
+                    } else {
+                        self.range_complete_emitted = true;
+                        // TODO why can't I declare that type?
+                        //type TT = <I::Aggregator as AggregatorTdim>::OutputValue;
+                        if let Some(k) = <I::Aggregator as AggregatorTdim>::OutputValue::make_range_complete_item() {
+                            return Ready(Some(Ok(k)));
+                        } else {
+                            warn!("IntoBinnedTDefaultStream  should emit RangeComplete but I doesn't have one");
+                            self.completed = true;
+                            Ready(None)
+                        }
                     }
                 } else {
+                    self.completed = true;
                     Ready(None)
                 }
             } else {
diff --git a/disk/src/cache/pbv.rs b/disk/src/cache/pbv.rs
index bb81f33..d9609d0 100644
--- a/disk/src/cache/pbv.rs
+++ b/disk/src/cache/pbv.rs
@@ -161,6 +161,7 @@ impl Stream for PreBinnedValueStream {
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
+        info!("PreBinnedValueStream  poll_next  ENTER");
         if self.completed {
             panic!("PreBinnedValueStream  poll_next on completed");
         }
@@ -168,7 +169,7 @@ impl Stream for PreBinnedValueStream {
             self.completed = true;
             return Ready(None);
         }
-        'outer: loop {
+        let u = 'outer: loop {
             break if let Some(fut) = self.fut2.as_mut() {
                 match fut.poll_next_unpin(cx) {
                     Ready(Some(k)) => match k {
@@ -217,6 +218,8 @@ impl Stream for PreBinnedValueStream {
                 self.open_check_local_file = Some(Box::pin(fut));
                 continue 'outer;
             };
-        }
+        };
+        info!("PBV EXIT WITH {:?}", u);
+        u
     }
 }
diff --git a/disk/src/cache/pbvfs.rs b/disk/src/cache/pbvfs.rs
index ebf24e7..1cd91bc 100644
--- a/disk/src/cache/pbvfs.rs
+++ b/disk/src/cache/pbvfs.rs
@@ -44,7 +44,7 @@ impl PreBinnedValueFetchedStream {
     }
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize)]
 pub enum PreBinnedItem {
     Batch(MinMaxAvgScalarBinBatch),
     RangeComplete,
diff --git a/disk/src/merge.rs b/disk/src/merge.rs
index 1ddbd51..47c98e2 100644
--- a/disk/src/merge.rs
+++ b/disk/src/merge.rs
@@ -258,6 +258,7 @@ where
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
+        info!("Merger poll ENTER");
         if self.completed {
             panic!("MergedMinMaxAvgScalarStream  poll_next on completed");
         }
@@ -265,7 +266,7 @@ where
             self.completed = true;
             return Ready(None);
         }
-        'outer: loop {
+        let u = 'outer: loop {
             break if self.data_emit_complete {
                 error!("MERGER NOTE  data_emit_complete");
                 if self.range_complete_observed_all {
@@ -359,7 +360,9 @@ where
                     Pending => Pending,
                 }
             };
-        }
+        };
+        info!("Merger poll DONE");
+        u
     }
 }