Manual merge

libmysql/libmysql.c

@@ -2862,6 +2862,17 @@ int STDCALL mysql_stmt_execute(MYSQL_STMT *stmt)
       mysql->status= MYSQL_STATUS_READY;
       stmt->read_row_func= stmt_read_row_from_cursor;
     }
+    else if (stmt->flags & CURSOR_TYPE_READ_ONLY)
+    {
+      /*
+        This is a single-row result set, a result set with no rows, EXPLAIN,
+        SHOW VARIABLES, or some other command which either a) bypasses the
+        cursors framework in the server and writes rows directly to the
+        network or b) is more efficient if all (few) result set rows are
+        precached on client and server's resources are freed.
+      */
+      DBUG_RETURN(mysql_stmt_store_result(stmt));
+    }
     else
     {
       stmt->mysql->unbuffered_fetch_owner= &stmt->unbuffered_fetch_cancelled;