diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result index a148d1029df..1ebed6d17d5 100644 --- a/mysql-test/r/select.result +++ b/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 diff --git a/mysql-test/t/select.test b/mysql-test/t/select.test index 1f8a00409e6..b513d17bfa0 100644 --- a/mysql-test/t/select.test +++ b/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 diff --git a/sql/share/errmsg.txt b/sql/share/errmsg.txt index 682eee06e02..3c9ee2073b8 100644 --- a/sql/share/errmsg.txt +++ b/sql/share/errmsg.txt @@ -5654,6 +5654,8 @@ ER_NON_INSERTABLE_TABLE ger "Die Zieltabelle %-.100s von %s ist nicht einfügbar" 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 diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc index da3a634ffd4..a9cac18564d 100644 --- a/sql/sql_parse.cc +++ b/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 diff --git a/sql/unireg.h b/sql/unireg.h index 6c26f30f116..29daee27617 100644 --- a/sql/unireg.h +++ b/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)