Correction of WL#1567: row_count() is -1 following non-insert/update/delete

statements.

mysql-test/r/sp.result

@@ -823,6 +823,11 @@ delete from t1|
 select row_count()|
 row_count()
 0
+select * from t1|
+id	data
+select row_count()|
+row_count()
+-1
 drop procedure rc|
 create procedure bug822(a_id char(16), a_data int)
 begin

mysql-test/t/sp.test

@@ -947,6 +947,8 @@ delete from t1|
 select row_count()|
 delete from t1|
 select row_count()|
+select * from t1|
+select row_count()|
 drop procedure rc|
 
 

sql/sql_class.h

@@ -829,7 +829,7 @@ class THD :public ilink,
   bool	     charset_is_system_charset, charset_is_collation_connection;
   bool       slow_command;
 
-  ulong      row_count_func;	/* For the ROW_COUNT() function */
+  longlong   row_count_func;	/* For the ROW_COUNT() function */
   sp_rcontext *spcont;		// SP runtime context
   sp_cache   *sp_proc_cache;
   sp_cache   *sp_func_cache;

sql/sql_parse.cc

@@ -3727,6 +3727,26 @@ mysql_execute_command(THD *thd)
   }
   thd->proc_info="query end";			// QQ
 
+  /*
+    The return value for ROW_COUNT() is "implementation dependent" if
+    the statement is not DELETE, INSERT or UPDATE (or a CALL executing
+    such a statement), but -1 is what JDBC and ODBC wants.
+   */
+  switch (lex->sql_command) {
+  case SQLCOM_UPDATE:
+  case SQLCOM_UPDATE_MULTI:
+  case SQLCOM_REPLACE:
+  case SQLCOM_INSERT:
+  case SQLCOM_REPLACE_SELECT:
+  case SQLCOM_INSERT_SELECT:
+  case SQLCOM_DELETE:
+  case SQLCOM_DELETE_MULTI:
+  case SQLCOM_CALL:
+    break;
+  default:
+    thd->row_count_func= -1;
+  }
+
   // We end up here if res == 0 and send_ok() has been done,
   // or res != 0 and no send_error() has yet been done.
   if (res < 0)