spaces-X commented on code in PR #65355:
URL: https://github.com/apache/doris/pull/65355#discussion_r3548506025


##########
be/src/storage/segment/column_reader.cpp:
##########
@@ -1171,12 +1171,22 @@ Status MapFileColumnIterator::next_batch(size_t* n, 
MutableColumnPtr& dst, bool*
             key_ptr->insert_many_defaults(num_items);
             val_ptr->insert_many_defaults(num_items);
         } else {
-            size_t num_read = num_items;
-            bool key_has_null = false;
-            bool val_has_null = false;
-            RETURN_IF_ERROR(_key_iterator->next_batch(&num_read, key_ptr, 
&key_has_null));
-            RETURN_IF_ERROR(_val_iterator->next_batch(&num_read, val_ptr, 
&val_has_null));
-            DCHECK(num_read == num_items);
+            auto read_or_fill_child = [&](ColumnIterator* iterator,
+                                          MutableColumnPtr& column) -> Status {
+                if (_read_phase == ReadPhase::LAZY && read_meta_columns &&
+                    iterator->read_requirement() == ReadRequirement::SKIP) {
+                    column->insert_many_defaults(num_items);
+                    return Status::OK();
+                }
+
+                bool dummy_has_null = false;
+                size_t num_read = num_items;
+                RETURN_IF_ERROR(iterator->next_batch(&num_read, column, 
&dummy_has_null));
+                DCHECK(num_read == num_items);
+                return Status::OK();
+            };
+            RETURN_IF_ERROR(read_or_fill_child(_key_iterator.get(), key_ptr));

Review Comment:
   this PR looks like it overlaps almost entirely with #65344 — both seem
   to fix the same bug?



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