Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.1-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B30639-5.1-opt

include/config-win.h

@@ -15,6 +15,8 @@
 
 /* Defines for Win32 to make it compatible for MySQL */
 
+#define BIG_TABLES
+
 #ifdef __WIN2000__
 /* We have to do this define before including windows.h to get the AWE API
 functions */

mysql-test/r/select.result

@@ -4082,3 +4082,20 @@ x
 1
 DROP VIEW v1, v2, v3;
 End of 5.0 tests
+create table t1(a INT, KEY (a));
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
+SELECT a FROM t1 ORDER BY a LIMIT 2;
+a
+1
+2
+SELECT a FROM t1 ORDER BY a LIMIT 2,4294967296;
+a
+3
+4
+5
+SELECT a FROM t1 ORDER BY a LIMIT 2,4294967297;
+a
+3
+4
+5
+DROP TABLE t1;

mysql-test/t/select.test

@@ -3474,3 +3474,13 @@ DROP VIEW v1, v2, v3;
 --enable_ps_protocol
 
 --echo End of 5.0 tests
+
+#
+# Bug #30639: limit offset,rowcount wraps when rowcount >= 2^32 in windows
+#
+create table t1(a INT, KEY (a));
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
+SELECT a FROM t1 ORDER BY a LIMIT 2;
+SELECT a FROM t1 ORDER BY a LIMIT 2,4294967296;
+SELECT a FROM t1 ORDER BY a LIMIT 2,4294967297;
+DROP TABLE t1;

sql/sql_lex.cc

@@ -2397,10 +2397,19 @@ st_lex::copy_db_to(char **p_db, size_t *p_db_length) const
 void st_select_lex_unit::set_limit(st_select_lex *sl)
 {
   ha_rows select_limit_val;
+  ulonglong val;
 
   DBUG_ASSERT(! thd->stmt_arena->is_stmt_prepare());
-  select_limit_val= (ha_rows)(sl->select_limit ? sl->select_limit->val_uint() :
-                                                 HA_POS_ERROR);
+  val= sl->select_limit ? sl->select_limit->val_uint() : HA_POS_ERROR;
+  select_limit_val= (ha_rows)val;
+#ifndef BIG_TABLES
+  /* 
+    Check for overflow : ha_rows can be smaller then ulonglong if
+    BIG_TABLES is off.
+    */
+  if (val != (ulonglong)select_limit_val)
+    select_limit_val= HA_POS_ERROR;
+#endif
   offset_limit_cnt= (ha_rows)(sl->offset_limit ? sl->offset_limit->val_uint() :
                                                  ULL(0));
   select_limit_cnt= select_limit_val + offset_limit_cnt;