.

wcfs/δbtail.go

@@ -137,7 +137,7 @@ type ΔBtail struct {
 // nodeTrack represents tracking information about a node.
 type nodeTrack struct {
 	parent      zodb.Oid // parent node | InvalidOid for root
-	trackedKeys SetKey   // keys tracked under this node; nil for root
+	trackedKeys SetKey   // keys tracked under this node; nil for root	XXX only !empty root
 }
 
 // ΔB represents a change in BTrees space.
@@ -517,6 +517,7 @@ func diffT(ctx context.Context, a, b *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 			aChildren[child.POid()] = child // InvalidOid = embedded bucket
 		}
 	}
+	fmt.Printf("  aChildren: %s\n", aChildren)
 
 	// -> "might be changed" subset of tracked keys
 	δtqkeys := SetKey{}
@@ -527,6 +528,7 @@ func diffT(ctx context.Context, a, b *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 		}
 		δtqkeys.Update(track.trackedKeys)
 	}
+	fmt.Printf("  δtqkeys:   %s\n", δtqkeys)
 
 	// b -> {bChildren} : coverage ∩ "might be changed" tracked keys
 	bChildren := map[zodb.Oid]Node{}
@@ -546,6 +548,7 @@ func diffT(ctx context.Context, a, b *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 			}
 		}
 	}
+	fmt.Printf("  bChildren: %s\n", bChildren)
 
 	// allChildren = aChildren ∪ bChildren
 	allChildren := SetOid{}