morrySnow commented on code in PR #24186:
URL: https://github.com/apache/doris/pull/24186#discussion_r1322510889


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/PartitionPruner.java:
##########
@@ -76,14 +78,23 @@ public static List<Long> prune(List<Slot> partitionSlots, 
Expression partitionPr
         partitionPredicate = TryEliminateUninterestedPredicates.rewrite(
                 partitionPredicate, ImmutableSet.copyOf(partitionSlots), 
cascadesContext);
 
+        Set<Long> defaultPartitionIds = Sets.newHashSet();
         List<OnePartitionEvaluator> evaluators = idToPartitions.entrySet()
                 .stream()
+                .peek(kv -> {
+                    if (kv.getValue().isDefaultPartition()) {
+                        defaultPartitionIds.add(kv.getKey());
+                    }
+                })
                 .map(kv -> toPartitionEvaluator(kv.getKey(), kv.getValue(), 
partitionSlots, cascadesContext,
                         partitionTableType))
                 .collect(ImmutableList.toImmutableList());
 
         PartitionPruner partitionPruner = new PartitionPruner(evaluators, 
partitionPredicate);
-        return partitionPruner.prune();
+        //TODO: we keep default partition because it's too hard to prune it.
+        Set<Long> prunedPartition = Sets.newHashSet(partitionPruner.prune());

Review Comment:
   why not change partitionPruner itself, to let it return correct set



##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/PartitionPruner.java:
##########
@@ -76,14 +78,23 @@ public static List<Long> prune(List<Slot> partitionSlots, 
Expression partitionPr
         partitionPredicate = TryEliminateUninterestedPredicates.rewrite(
                 partitionPredicate, ImmutableSet.copyOf(partitionSlots), 
cascadesContext);
 
+        Set<Long> defaultPartitionIds = Sets.newHashSet();
         List<OnePartitionEvaluator> evaluators = idToPartitions.entrySet()
                 .stream()
+                .peek(kv -> {
+                    if (kv.getValue().isDefaultPartition()) {
+                        defaultPartitionIds.add(kv.getKey());
+                    }
+                })
                 .map(kv -> toPartitionEvaluator(kv.getKey(), kv.getValue(), 
partitionSlots, cascadesContext,
                         partitionTableType))
                 .collect(ImmutableList.toImmutableList());
 
         PartitionPruner partitionPruner = new PartitionPruner(evaluators, 
partitionPredicate);
-        return partitionPruner.prune();
+        //TODO: we keep default partition because it's too hard to prune it.
+        Set<Long> prunedPartition = Sets.newHashSet(partitionPruner.prune());

Review Comment:
   use `ImmutableSet.Builder`, add defaultPartitionId to this builder directly



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