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Bug#14654 : Cannot select from the same table twice within a UNION statement 

 Made the parser to support parenthesis around UNION branches.
 This is done by amending the rules of the parser so it generates the correct
 structure.
 Currently it supports arbitrary subquery/join/parenthesis operations in the 
 EXISTS clause. 
 In the IN/scalar subquery case it will allow adding nested parenthesis only 
 if there is an UNION clause after the parenthesis. Otherwise it will just  
 treat the multiple nested parenthesis as a scalar expression.
 It adds extra lex level for ((SELECT ...) UNION ...) to accommodate for the
 UNION clause.


mysql-test/r/subselect.result:
  Bug#14654 : Cannot select from the same table twice within a UNION statement
   - test cases
mysql-test/t/subselect.test:
  Bug#14654 : Cannot select from the same table twice within a UNION statement
   - test cases
sql/sql_yacc.yy:
  Bug#14654 : Cannot select from the same table twice within a UNION statement
   - shuffle around the rules for the parenthesis in subselect
parent 1cbebc6e
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Showing with 123 additions and 70 deletions
mysql-test/r/subselect.result
View file @ c9bba13a
......@@ -3346,3 +3346,28 @@ ORDER BY t1.t DESC LIMIT 1);
i1 i2 t i1 i2 t
24 1 2005-05-27 12:40:30 24 1 2006-06-20 12:29:40
DROP TABLE t1, t2;
CREATE TABLE t1 (i INT);
(SELECT i FROM t1) UNION (SELECT i FROM t1);
i
SELECT sql_no_cache * FROM t1 WHERE NOT EXISTS
(
(SELECT i FROM t1) UNION
(SELECT i FROM t1)
);
i
SELECT * FROM t1
WHERE NOT EXISTS (((SELECT i FROM t1) UNION (SELECT i FROM t1)));
i
explain select ((select t11.i from t1 t11) union (select t12.i from t1 t12))
from t1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union (select t12.i from t1 t12))
from t1' at line 1
explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
4 UNION t12 system NULL NULL NULL NULL 0 const row not found
NULL UNION RESULT <union2,4> ALL NULL NULL NULL NULL NULL
DROP TABLE t1;
mysql-test/t/subselect.test
View file @ c9bba13a
......@@ -2257,3 +2257,29 @@ SELECT * FROM t1,t2
ORDER BY t1.t DESC LIMIT 1);
DROP TABLE t1, t2;
#
# Bug#14654 : Cannot select from the same table twice within a UNION
# statement
#
CREATE TABLE t1 (i INT);
(SELECT i FROM t1) UNION (SELECT i FROM t1);
SELECT sql_no_cache * FROM t1 WHERE NOT EXISTS
(
(SELECT i FROM t1) UNION
(SELECT i FROM t1)
);
SELECT * FROM t1
WHERE NOT EXISTS (((SELECT i FROM t1) UNION (SELECT i FROM t1)));
#TODO:not supported
--error 1064
explain select ((select t11.i from t1 t11) union (select t12.i from t1 t12))
from t1;
#supported
explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
DROP TABLE t1;
sql/sql_yacc.yy
View file @ c9bba13a
......@@ -725,8 +725,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
predicate bit_expr bit_term bit_factor value_expr term factor
table_wild simple_expr udf_expr
expr_or_default set_expr_or_default interval_expr
param_marker singlerow_subselect singlerow_subselect_init
exists_subselect exists_subselect_init geometry_function
param_marker geometry_function
signed_literal now_or_signed_literal opt_escape
sp_opt_default
simple_ident_nospvar simple_ident_q
......@@ -791,7 +790,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
%type <variable> internal_variable_name
%type <select_lex> in_subselect in_subselect_init
%type <select_lex> subselect subselect_init
get_select_lex
%type <boolfunc2creator> comp_op
......@@ -3915,7 +3914,9 @@ select_paren:
YYABORT;
}
if (sel->linkage == UNION_TYPE &&
!sel->master_unit()->first_select()->braces)
!sel->master_unit()->first_select()->braces &&
sel->master_unit()->first_select()->linkage ==
UNION_TYPE)
{
yyerror(ER(ER_SYNTAX_ERROR));
YYABORT;
......@@ -4177,37 +4178,37 @@ bool_pri:
| bool_pri EQUAL_SYM predicate { $$= new Item_func_equal($1,$3); }
| bool_pri comp_op predicate %prec EQ
{ $$= (*$2)(0)->create($1,$3); }
| bool_pri comp_op all_or_any in_subselect %prec EQ
{ $$= all_any_subquery_creator($1, $2, $3, $4); }
| bool_pri comp_op all_or_any '(' subselect ')' %prec EQ
{ $$= all_any_subquery_creator($1, $2, $3, $5); }
| predicate ;
predicate:
bit_expr IN_SYM '(' expr_list ')'
bit_expr IN_SYM '(' subselect ')'
{ $$= new Item_in_subselect($1, $4); }
| bit_expr not IN_SYM '(' subselect ')'
{ $$= negate_expression(YYTHD, new Item_in_subselect($1, $5)); }
| bit_expr IN_SYM '(' expr ')'
{
if ($4->elements == 1)
$$= new Item_func_eq($1, $4->head());
else
{
$4->push_front($1);
$$= new Item_func_in(*$4);
$$= new Item_func_eq($1, $4);
}
| bit_expr IN_SYM '(' expr ',' expr_list ')'
{
$6->push_front($4);
$6->push_front($1);
$$= new Item_func_in(*$6);
}
| bit_expr not IN_SYM '(' expr_list ')'
| bit_expr not IN_SYM '(' expr ')'
{
if ($5->elements == 1)
$$= new Item_func_ne($1, $5->head());
else
$$= new Item_func_ne($1, $5);
}
| bit_expr not IN_SYM '(' expr ',' expr_list ')'
{
$5->push_front($1);
Item_func_in *item = new Item_func_in(*$5);
$7->push_front($5);
$7->push_front($1);
Item_func_in *item = new Item_func_in(*$7);
item->negate();
$$= item;
}
}
| bit_expr IN_SYM in_subselect
{ $$= new Item_in_subselect($1, $3); }
| bit_expr not IN_SYM in_subselect
{ $$= negate_expression(YYTHD, new Item_in_subselect($1, $4)); }
| bit_expr BETWEEN_SYM bit_expr AND_SYM predicate
{ $$= new Item_func_between($1,$3,$5); }
| bit_expr not BETWEEN_SYM bit_expr AND_SYM predicate
......@@ -4329,6 +4330,10 @@ simple_expr:
| '-' simple_expr %prec NEG { $$= new Item_func_neg($2); }
| '~' simple_expr %prec NEG { $$= new Item_func_bit_neg($2); }
| not2 simple_expr %prec NEG { $$= negate_expression(YYTHD, $2); }
| '(' subselect ')'
{
$$= new Item_singlerow_subselect($2);
}
| '(' expr ')' { $$= $2; }
| '(' expr ',' expr_list ')'
{
......@@ -4340,8 +4345,10 @@ simple_expr:
$5->push_front($3);
$$= new Item_row(*$5);
}
| EXISTS exists_subselect { $$= $2; }
| singlerow_subselect { $$= $1; }
| EXISTS '(' subselect ')'
{
$$= new Item_exists_subselect($3);
}
| '{' ident expr '}' { $$= $3; }
| MATCH ident_list_arg AGAINST '(' bit_expr fulltext_options ')'
{ $2->push_front($5);
......@@ -8863,49 +8870,38 @@ union_option:
| ALL { $$=0; }
;
singlerow_subselect:
subselect_start singlerow_subselect_init
subselect_end
{
$$= $2;
};
singlerow_subselect_init:
select_init2
{
$$= new Item_singlerow_subselect(Lex->current_select->
master_unit()->first_select());
};
exists_subselect:
subselect_start exists_subselect_init
subselect_end
{
$$= $2;
};
exists_subselect_init:
select_init2
subselect:
SELECT_SYM subselect_start subselect_init subselect_end
{
$$= new Item_exists_subselect(Lex->current_select->master_unit()->
first_select());
};
in_subselect:
subselect_start in_subselect_init
subselect_end
$$= $3;
}
| '(' subselect_start subselect ')'
{
$$= $2;
};
LEX *lex= Lex;
THD *thd= YYTHD;
/*
note that a local variable can't be used for
$3 as it's used in local variable construction
and some compilers can't guarnatee the order
in which the local variables are initialized.
*/
List_iterator<Item> it($3->item_list);
Item *item;
/*
we must fill the items list for the "derived table".
*/
while ((item= it++))
add_item_to_list(thd, item);
}
union_clause subselect_end { $$= $3; };
in_subselect_init:
subselect_init:
select_init2
{
$$= Lex->current_select->master_unit()->first_select();
};
subselect_start:
'(' SELECT_SYM
{
LEX *lex=Lex;
if (lex->sql_command == (int)SQLCOM_HA_READ ||
......@@ -8914,12 +8910,18 @@ subselect_start:
yyerror(ER(ER_SYNTAX_ERROR));
YYABORT;
}
/*
we are making a "derived table" for the parenthesis
as we need to have a lex level to fit the union
after the parenthesis, e.g.
(SELECT .. ) UNION ... becomes
SELECT * FROM ((SELECT ...) UNION ...)
*/
if (mysql_new_select(Lex, 1))
YYABORT;
};
subselect_end:
')'
{
LEX *lex=Lex;
lex->pop_context();
......
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