szehon-ho commented on code in PR #9251:
URL: https://github.com/apache/iceberg/pull/9251#discussion_r1424802087


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core/src/main/java/org/apache/iceberg/DeleteFileIndex.java:
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@@ -474,68 +421,52 @@ private Collection<DeleteFile> loadDeleteFiles() {
     DeleteFileIndex build() {
       Iterable<DeleteFile> files = deleteFiles != null ? filterDeleteFiles() : 
loadDeleteFiles();
 
-      boolean useColumnStatsFiltering = false;
+      EqualityDeletes globalDeletes = new EqualityDeletes();
+      PartitionMap<EqualityDeletes> eqDeletesByPartition = 
PartitionMap.create(specsById);
+      PartitionMap<PositionDeletes> posDeletesByPartition = 
PartitionMap.create(specsById);
+      CharSequenceMap<PositionDeletes> posDeletesByPath = 
CharSequenceMap.create();

Review Comment:
   It is possible we'll see a memory growth with using path map, example if we 
have a million data files, can be ~100 mbs, if i calculate correctly?.  (We use 
DeleteFileIndex centrally if i understand correctly).  I wonder if we 
considered doing some common-prefix encoding, or other encoding, of paths 
anywhere.  Not sure if its worth it , given the typical memory size of planner



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