This is just to get columnstore to compile

This commit can be ignored when columnstore changes to use
rows_stats.updated+rows_stats.rows_inserted+rows_stats.rows_deleted
instead of 'rows_changed'
in storage/columnstore/columnstore/dbcon/mysql/ha_mcs_impl.cpp

sql/handler.h

@@ -3295,6 +3295,7 @@ class handler :public Sql_alloc
     inserter.
   */
   /* Statistics  variables */
+  ulonglong rows_changed;   /* This is just to get columnstore to compile */
   struct rows_stats rows_stats;
   /* One bigger than needed to avoid to test if key == MAX_KEY */
   ulonglong index_rows_read[MAX_KEY+1];