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Bug#23345: Wrongly allowed INTO in a non-last select of a UNION.

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INTO clause can be specified only for the last select of a UNION and it
receives the result of the whole query. But it was wrongly allowed in
non-last selects of a UNION which leads to a confusing query result.

Now INTO allowed only in the last select of a UNION.
This commit is contained in:
evgen@moonbone.local 2007-03-21 21:54:38 +03:00
parent 31b9145ab3
commit 72bf9b4847
3 changed files with 18 additions and 1 deletions
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8
mysql-test/r/union.result
View File

@ -1381,4 +1381,12 @@ a
SELECT a FROM (SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY c) AS test;
ERROR 42S22: Unknown column 'c' in 'order clause'
DROP TABLE t1;
(select 1 into @var) union (select 1);
ERROR HY000: Incorrect usage of UNION and INTO
(select 1) union (select 1 into @var);
select @var;
@var
1
(select 2) union (select 1 into @var);
ERROR 42000: Result consisted of more than one row
End of 5.0 tests

9
mysql-test/t/union.test
View File

@ -868,4 +868,13 @@ SELECT a FROM (SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY c) AS test;
DROP TABLE t1;
#
# Bug#23345: Wrongly allowed INTO in a non-last select of a UNION.
#
--error 1221
(select 1 into @var) union (select 1);
(select 1) union (select 1 into @var);
select @var;
--error 1172
(select 2) union (select 1 into @var);
--echo End of 5.0 tests

2
sql/sql_yacc.yy
View File

@ -9307,7 +9307,7 @@ union_list:
UNION_SYM union_option
{
LEX *lex=Lex;
if (lex->exchange)
if (lex->result)
{
/* Only the last SELECT can have INTO...... */
my_error(ER_WRONG_USAGE, MYF(0), "UNION", "INTO");