Merge gleb.loc:/home/uchum/work/bk/5.0-opt

into  gleb.loc:/home/uchum/work/bk/5.1-opt

mysql-test/r/select.result

@@ -3980,4 +3980,14 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	f1	index	inx	inx	10	NULL	7	Using where; Using index
 1	SIMPLE	f2	ref	inx	inx	5	test.f1.b	1	Using where; Using index
 DROP TABLE t1;
+CREATE TABLE t1 (c1 INT, c2 INT);
+INSERT INTO t1 VALUES (1,11), (2,22), (2,22);
+EXPLAIN SELECT c1 FROM t1 WHERE (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT COUNT(c2)))))))))))))))))))))))))))))))) > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+31	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+32	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+EXPLAIN SELECT c1 FROM t1 WHERE (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT COUNT(c2))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) > 0;
+ERROR HY000: Too high level of nesting for select
+DROP TABLE t1;
 End of 5.0 tests

mysql-test/t/select.test

@@ -3359,4 +3359,34 @@ EXPLAIN SELECT COUNT(*) FROM t1 f1 INNER JOIN t1 f2
     WHERE 1 AND f1.b NOT IN (100,2232,3343,51111);
 DROP TABLE t1;    
 
+#
+# Bug #27352: Incorrect result of nested selects instead of error reporting
+#
+
+CREATE TABLE t1 (c1 INT, c2 INT);
+INSERT INTO t1 VALUES (1,11), (2,22), (2,22);
+
+let $n= 31;
+let $q= COUNT(c2);
+while ($n)
+{
+  let $q= (SELECT $q);
+  dec $n;
+}
+--disable_warnings
+eval EXPLAIN SELECT c1 FROM t1 WHERE $q > 0;
+--enable_warnings
+
+let $n= 64;
+let $q= COUNT(c2);
+while ($n)
+{
+  let $q= (SELECT $q);
+  dec $n;
+}
+--error ER_TOO_HIGH_LEVEL_OF_NESTING_FOR_SELECT
+eval EXPLAIN SELECT c1 FROM t1 WHERE $q > 0;
+
+DROP TABLE t1;
+
 --echo End of 5.0 tests

sql/share/errmsg.txt

@@ -5654,6 +5654,8 @@ ER_NON_INSERTABLE_TABLE
         ger "Die Zieltabelle %-.100s von %s ist nicht einfgbar"
 ER_ADMIN_WRONG_MRG_TABLE
 	eng "Table '%-.64s' is differently defined or of non-MyISAM type or doesn't exist"
+ER_TOO_HIGH_LEVEL_OF_NESTING_FOR_SELECT
+	eng "Too high level of nesting for select"
 ER_FOREIGN_SERVER_EXISTS
         eng "The foreign server, %s, you are trying to create already exists."
 ER_FOREIGN_SERVER_DOESNT_EXIST

sql/sql_parse.cc

@@ -5230,6 +5230,11 @@ mysql_new_select(LEX *lex, bool move_down)
   select_lex->init_query();
   select_lex->init_select();
   lex->nest_level++;
+  if (lex->nest_level > (int) MAX_SELECT_NESTING)
+  {
+    my_error(ER_TOO_HIGH_LEVEL_OF_NESTING_FOR_SELECT,MYF(0),MAX_SELECT_NESTING);
+    DBUG_RETURN(1);
+  }
   select_lex->nest_level= lex->nest_level;
   /*
     Don't evaluate this subquery during statement prepare even if

sql/unireg.h

@@ -85,6 +85,8 @@
 #define MAX_FIELDS	4096			/* Limit in the .frm file */
 #define MAX_PARTITIONS  1024
 
+#define MAX_SELECT_NESTING (sizeof(nesting_map)*8-1)
+
 #define MAX_SORT_MEMORY (2048*1024-MALLOC_OVERHEAD)
 #define MIN_SORT_MEMORY (32*1024-MALLOC_OVERHEAD)