Merge moonlight.intranet:/home/tomash/src/mysql_ab/mysql-5.0

into  moonlight.intranet:/home/tomash/src/mysql_ab/mysql-5.0-bug21013

mysql-test/r/sp.result

@@ -5057,4 +5057,16 @@ concat('data was: /', var1, '/')
 data was: /1/
 drop table t3|
 drop procedure bug15217|
+DROP PROCEDURE IF EXISTS bug21013 |
+CREATE PROCEDURE bug21013(IN lim INT)
+BEGIN
+DECLARE i INT DEFAULT 0;
+WHILE (i < lim) DO
+SET @b = LOCATE(_latin1'b', @a, 1);
+SET i = i + 1;
+END WHILE;
+END |
+SET @a = _latin2"aaaaaaaaaa" |
+CALL bug21013(10) |
+DROP PROCEDURE bug21013 |
 drop table t1,t2;

mysql-test/t/sp.test

@@ -5962,6 +5962,33 @@ call bug15217()|
 drop table t3|
 drop procedure bug15217|
 
+
+#
+# BUG#21013: Performance Degrades when importing data that uses
+# Trigger and Stored Procedure
+#
+# This is a performance and memory leak test.  Run with large number
+# passed to bug21013() procedure.
+#
+--disable_warnings
+DROP PROCEDURE IF EXISTS bug21013 |
+--enable_warnings
+
+CREATE PROCEDURE bug21013(IN lim INT)
+BEGIN
+  DECLARE i INT DEFAULT 0;
+  WHILE (i < lim) DO
+    SET @b = LOCATE(_latin1'b', @a, 1);
+    SET i = i + 1;
+  END WHILE;
+END |
+
+SET @a = _latin2"aaaaaaaaaa" |
+CALL bug21013(10) |
+
+DROP PROCEDURE bug21013 |
+
+
 #
 # BUG#NNNN: New bug synopsis
 #

sql/item.cc

@@ -1418,7 +1418,8 @@ bool agg_item_charsets(DTCollation &coll, const char *fname,
     In case we're in statement prepare, create conversion item
     in its memory: it will be reused on each execute.
   */
-  arena= thd->activate_stmt_arena_if_needed(&backup);
+  arena= thd->is_stmt_prepare() ? thd->activate_stmt_arena_if_needed(&backup)
+                                : NULL;
 
   for (i= 0, arg= args; i < nargs; i++, arg+= item_sep)
   {
@@ -1453,7 +1454,7 @@ bool agg_item_charsets(DTCollation &coll, const char *fname,
       been created in prepare. In this case register the change for
       rollback.
     */
-    if (arena && arena->is_conventional())
+    if (arena)
       *arg= conv;
     else
       thd->change_item_tree(arg, conv);