fix: remove delete future side chains

core/rawdb/chain_freezer.go

@@ -240,40 +240,6 @@ func (f *chainFreezer) freeze(db ethdb.KeyValueStore) {
 		}
 		batch.Reset()
 
-		// Step into the future and delete any dangling side chains
-		if frozen > 0 {
-			tip := frozen
-			for len(dangling) > 0 {
-				drop := make(map[common.Hash]struct{})
-				for _, hash := range dangling {
-					log.Debug("Dangling parent from Freezer", "number", tip-1, "hash", hash)
-					drop[hash] = struct{}{}
-				}
-				children := ReadAllHashes(db, tip)
-				for i := 0; i < len(children); i++ {
-					// Dig up the child and ensure it's dangling
-					child := ReadHeader(nfdb, children[i], tip)
-					if child == nil {
-						log.Error("Missing dangling header", "number", tip, "hash", children[i])
-						continue
-					}
-					if _, ok := drop[child.ParentHash]; !ok {
-						children = append(children[:i], children[i+1:]...)
-						i--
-						continue
-					}
-					// Delete all block data associated with the child
-					log.Debug("Deleting dangling block", "number", tip, "hash", children[i], "parent", child.ParentHash)
-					DeleteBlock(batch, children[i], tip)
-				}
-				dangling = children
-				tip++
-			}
-			if err := batch.Write(); err != nil {
-				log.Crit("Failed to delete dangling side blocks", "err", err)
-			}
-		}
-
 		// Log something friendly for the user
 		context := []interface{}{
 			"blocks", frozen - first, "elapsed", common.PrettyDuration(time.Since(start)), "number", frozen - 1,