MDEV-19008 Slow EXPLAIN SELECT ... WHERE col IN (const1,const2,(subquery))

1 files changed, 10 insertions, 0 deletions

diff --git a/sql/item.h b/sql/item.h
index 4eab7090276..883cc791f38 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -1409,6 +1409,16 @@ public:
                      LOWEST_PRECEDENCE);
   }
   virtual void print(String *str, enum_query_type query_type);
+
+  class Print: public String
+  {
+  public:
+    Print(Item *item, enum_query_type type)
+    {
+      item->print(this, type);
+    }
+  };
+
   void print_item_w_name(String *str, enum_query_type query_type);
   void print_value(String *str);