1 files changed, 12 insertions, 0 deletions
diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index 5e9b5a85275..7f91246a982 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -1759,6 +1759,18 @@ bool Item_func_ucase::fix_length_and_dec()
 }
 
 
+bool Item_func_left::hash_not_null(Hasher *hasher)
+{
+  StringBuffer<STRING_BUFFER_USUAL_SIZE> buf;
+  String *str= val_str(&buf);
+  DBUG_ASSERT((str == NULL) == null_value);
+  if (!str)
+    return true;
+  hasher->add(collation.collation, str->ptr(), str->length());
+  return false;
+}
+
+
 String *Item_func_left::val_str(String *str)
 {
   DBUG_ASSERT(fixed());