1 files changed, 34 insertions, 0 deletions
diff --git a/sql/sql_list.cc b/sql/sql_list.cc
index 01ab9b91424..49b649133d0 100644
--- a/sql/sql_list.cc
+++ b/sql/sql_list.cc
@@ -36,3 +36,37 @@ void free_list(I_List <i_string> *list)
   while ((tmp= list->get()))
     delete tmp;
 }
+
+
+base_list::base_list(const base_list &rhs, MEM_ROOT *mem_root)
+{
+  if (rhs.elements)
+  {
+    /*
+      It's okay to allocate an array of nodes at once: we never
+      call a destructor for list_node objects anyway.
+    */
+    first= (list_node*) alloc_root(mem_root,
+                                   sizeof(list_node) * rhs.elements);
+    if (first)
+    {
+      elements= rhs.elements;
+      list_node *dst= first;
+      list_node *src= rhs.first;
+      for (; dst < first + elements - 1; dst++, src= src->next)
+      {
+        dst->info= src->info;
+        dst->next= dst + 1;
+      }
+      /* Copy the last node */
+      dst->info= src->info;
+      dst->next= &end_of_list;
+      /* Setup 'last' member */
+      last= &dst->next;
+      return;
+    }
+  }
+  elements= 0;
+  first= &end_of_list;
+  last= &first;
+}