Fix VersionInfo SelectionVector creation

src/include/common/data_chunk/sel_vector.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <string.h>
+
 #include <memory>
 
 #include "common/constants.h"
@@ -58,6 +60,13 @@ class SelectionVector {
         selectedSize = size;
     }
 
+    // Copies the data in selectedPositions into selectedPositionsBuffer
+    void makeDynamic() {
+        memcpy(selectedPositionsBuffer.get(), selectedPositions, selectedSize * sizeof(sel_t));
+        state = State::DYNAMIC;
+        selectedPositions = selectedPositionsBuffer.get();
+    }
+
     std::span<sel_t> getMutableBuffer() const {
         return std::span<sel_t>(selectedPositionsBuffer.get(), capacity);
     }

src/storage/store/version_info.cpp

@@ -100,6 +100,11 @@ void VectorVersionInfo::getSelVectorForScan(const transaction_t startTS,
             selVector.setToFiltered(numSelected);
         }
     } else if (insertionStatus != InsertionStatus::NO_INSERTED) {
+        // If there were no deleted values up to this point the selVector may be unfiltered but have
+        // non-zero size, and the mutable buffer may have arbitrary contents
+        if (selVector.isUnfiltered()) {
+            selVector.makeDynamic();
+        }
         for (auto i = 0u; i < numRows; i++) {
             if (const auto rowIdx = startRow + i; isInserted(startTS, transactionID, rowIdx) &&
                                                   !isDeleted(startTS, transactionID, rowIdx)) {

test/test_files/dml_rel/delete/delete_ldbc_sf01.test

@@ -1,9 +1,7 @@
 -DATASET CSV ldbc-sf01
 --
 
-# FIX-ME(Guodong): https://github.com/kuzudb/kuzu/issues/4271
 -CASE DeleteLikeComment1
--SKIP
 -STATEMENT MATCH (n:Person)-[e:likes_Comment]->(m:Comment) WHERE n.id=6597069767457 RETURN COUNT(*);
 ---- 1
 66