mikemccand commented on code in PR #12624:
URL: https://github.com/apache/lucene/pull/12624#discussion_r1392603399


##########
lucene/core/src/java/org/apache/lucene/util/fst/BytesStore.java:
##########
@@ -21,12 +21,13 @@
 import java.util.List;
 import org.apache.lucene.store.DataInput;
 import org.apache.lucene.store.DataOutput;
+import org.apache.lucene.util.Accountable;
 import org.apache.lucene.util.RamUsageEstimator;
 
-// TODO: merge with PagedBytes, except PagedBytes doesn't
-// let you read while writing which FST needs
+// TODO: merge with or use PagedBytes/ByteBuffersDataOutput, as we no longer 
need to read while
+// writing
 
-class BytesStore extends DataOutput implements FSTReader {
+class BytesStore extends DataOutput implements Accountable {

Review Comment:
   > The 2nd and 3rd use case has been moved to use ByteBuffersDataOutput, so 
it is only used as the scratch area writer now.
   
   Yay, progress :)
   
   > * Act as a scratch area writer with some complex backward writing 
operations
   
   Hmm where do we do this?  I guess it is where we do in-place fixing of arc 
encoding after we've decided whether it should be sparse/dense/contiguous?



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