diff --git a/be/src/vec/olap/vcollect_iterator.cpp b/be/src/vec/olap/vcollect_iterator.cpp
index 7d4560f107d341..b9160514ad06f1 100644
--- a/be/src/vec/olap/vcollect_iterator.cpp
+++ b/be/src/vec/olap/vcollect_iterator.cpp
@@ -31,6 +31,12 @@ namespace vectorized {
         }                                                                               \
     } while (false)
 
+VCollectIterator::~VCollectIterator() {
+    for (auto child : _children) {
+        delete child;
+    }
+}
+
 void VCollectIterator::init(TabletReader* reader, bool force_merge, bool is_reverse) {
     _reader = reader;
     // when aggregate is enabled or key_type is DUP_KEYS, we don't merge
diff --git a/be/src/vec/olap/vcollect_iterator.h b/be/src/vec/olap/vcollect_iterator.h
index 815752f28c108e..b16f752bc01aa5 100644
--- a/be/src/vec/olap/vcollect_iterator.h
+++ b/be/src/vec/olap/vcollect_iterator.h
@@ -37,7 +37,7 @@ namespace vectorized {
 class VCollectIterator {
 public:
     // Hold reader point to get reader params
-    ~VCollectIterator() = default;
+    ~VCollectIterator();
 
     void init(TabletReader* reader, bool force_merge, bool is_reverse);