diff --git a/src/sql/dtl/ob_dtl_vectors_buffer.cpp b/src/sql/dtl/ob_dtl_vectors_buffer.cpp
index a0e527f2b0..4b1d8c15e1 100644
--- a/src/sql/dtl/ob_dtl_vectors_buffer.cpp
+++ b/src/sql/dtl/ob_dtl_vectors_buffer.cpp
@@ -321,24 +321,29 @@ int ObDtlVectors::init(const common::ObIArray<ObExpr*> &exprs, ObEvalCtx &ctx)
         }
       }
       if (OB_SUCC(ret) && *col_cnt_ > 0) {
-        row_size_ = row_size;
-        row_limit_ = remain_size / row_size;
-        if (row_size * row_limit_ + *col_cnt_ * ObBitVector::memory_size(row_limit_) > remain_size) {
-          row_limit_ = (remain_size - *col_cnt_ * ObBitVector::memory_size(row_limit_)) / row_size;
-        }
-        if (row_limit_ <= 0) {
-          ret =OB_ERR_UNEXPECTED;
-          LOG_WARN("failed to calc max row cnt", K(remain_size), K(row_size), K(ret));
-        } else {
-          for (int64_t i = 0; i < exprs.count(); ++i) {
-            VectorInfo &info = infos_[i];
-            info.nulls_offset_ = pos;
-            ObBitVector *nulls = to_bit_vector(buf_ + pos);
-            nulls->reset(row_limit_);
-            pos += ObBitVector::memory_size(row_limit_);
-            info.data_offset_ = pos;
-            pos += row_limit_ * info.fixed_len_;
+        if (row_size != 0){
+          row_size_ = row_size;
+          row_limit_ = remain_size / row_size;
+          if (row_size * row_limit_ + *col_cnt_ * ObBitVector::memory_size(row_limit_) > remain_size) {
+            row_limit_ = (remain_size - *col_cnt_ * ObBitVector::memory_size(row_limit_)) / row_size;
           }
+          if (row_limit_ <= 0) {
+            ret = OB_ERR_UNEXPECTED;
+            LOG_WARN("failed to calc max row cnt", K(remain_size), K(row_size), K(ret));
+          } else {
+            for (int64_t i = 0; i < exprs.count(); ++i) {
+              VectorInfo &info = infos_[i];
+              info.nulls_offset_ = pos;
+              ObBitVector *nulls = to_bit_vector(buf_ + pos);
+              nulls->reset(row_limit_);
+              pos += ObBitVector::memory_size(row_limit_);
+              info.data_offset_ = pos;
+              pos += row_limit_ * info.fixed_len_;
+            }
+          }
+        } else {
+          ret = OB_ERR_UNEXPECTED;
+          LOG_WARN("unexpected row_size", K(row_size), K(ret));
         }
       }
     }
diff --git a/src/sql/engine/basic/ob_chunk_datum_store.cpp b/src/sql/engine/basic/ob_chunk_datum_store.cpp
index a5e5129756..7a60858237 100644
--- a/src/sql/engine/basic/ob_chunk_datum_store.cpp
+++ b/src/sql/engine/basic/ob_chunk_datum_store.cpp
@@ -633,9 +633,7 @@ void ObChunkDatumStore::reset()
     if (nullptr != callback_) {
       callback_->free(item->get_buffer()->mem_size());
     }
-    if (NULL != item) {
-      allocator_->free(item);
-    }
+    allocator_->free(item);
   }
 
   if (NULL != batch_ctx_) {
diff --git a/src/sql/engine/join/ob_hash_join_op.cpp b/src/sql/engine/join/ob_hash_join_op.cpp
index 3093213105..5d7644f901 100644
--- a/src/sql/engine/join/ob_hash_join_op.cpp
+++ b/src/sql/engine/join/ob_hash_join_op.cpp
@@ -607,14 +607,18 @@ void ObHashJoinOp::part_rescan()
     for (int64_t i = 0; i < part_count_; i ++) {
       hj_part_array_[i].~ObHashJoinPartition();
     }
-    alloc_->free(hj_part_array_);
+    if (OB_NOT_NULL(alloc_)) {
+      alloc_->free(hj_part_array_);
+    }
     hj_part_array_ = NULL;
   }
   if (right_hj_part_array_ != NULL) {
     for (int64_t i = 0; i < part_count_; i ++) {
       right_hj_part_array_[i].~ObHashJoinPartition();
     }
-    alloc_->free(right_hj_part_array_);
+    if (OB_NOT_NULL(alloc_)) {
+      alloc_->free(right_hj_part_array_);
+    }
     right_hj_part_array_ = NULL;
   }
   int64_t tmp_part_count = 0 < level2_part_count_ ?
@@ -624,11 +628,15 @@ void ObHashJoinOp::part_rescan()
     for (int64_t i = 0; i < tmp_part_count; i ++) {
       part_histograms_[i].~HashJoinHistogram();
     }
-    alloc_->free(part_histograms_);
+    if (OB_NOT_NULL(alloc_)) {
+      alloc_->free(part_histograms_);
+    }
     part_histograms_ = NULL;
   }
   if (OB_NOT_NULL(part_selectors_)) {
-    alloc_->free(part_selectors_);
+    if (OB_NOT_NULL(alloc_)) {
+      alloc_->free(part_selectors_);
+    }
     part_selectors_ = nullptr;
     part_selector_sizes_ = nullptr;
   }