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Fix for a bug involving UNION's and SET SQL_SELECT_LIMIT

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Sinisa@sinisa.nasamreza.org 2004-05-03 19:15:26 +03:00
parent 0a6da89f71
commit 333eadf1b2
3 changed files with 27 additions and 3 deletions
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11
mysql-test/r/union.result
View file

@ -924,3 +924,14 @@ a
1
2
2
set sql_select_limit=1;
select 1 union select 2;
1
1
(select 1) union (select 2);
1
1
(select 1) union (select 2) union (select 3) limit 2;
1
1
2

4
mysql-test/t/union.test
View file

@ -498,4 +498,8 @@ select * from t1 UNION ALL select * from t1;
select * from t1 UNION select * from t1 UNION ALL select * from t1;
drop table t1;
select 1 as a union all select 1 union all select 2 union select 1 union all select 2;
set sql_select_limit=1;
select 1 union select 2;
(select 1) union (select 2);
(select 1) union (select 2) union (select 3) limit 2;

15
sql/sql_union.cc
View file

@ -377,12 +377,21 @@ int st_select_lex_unit::exec()
if (!thd->is_fatal_error) // Check if EOM
{
ulong options_tmp= thd->options;
/*
We have to take into the account a case when:
SET SQL_SELECT_LIMIT was set.
In mysql_new_select() function this value was copied to
the fake_select_lex node of the top-level unit.
Here below, we just take this value if global LIMIT was not applied
to the entire UNION.
*/
ha_rows select_limit= ((global_parameters->select_limit != HA_POS_ERROR) ?
global_parameters->select_limit : fake_select_lex->select_limit);
thd->lex->current_select= fake_select_lex;
offset_limit_cnt= global_parameters->offset_limit;
select_limit_cnt= global_parameters->select_limit +
global_parameters->offset_limit;
select_limit_cnt= select_limit + global_parameters->offset_limit;
if (select_limit_cnt < global_parameters->select_limit)
if (select_limit_cnt < select_limit)
select_limit_cnt= HA_POS_ERROR; // no limit
if (select_limit_cnt == HA_POS_ERROR)
options_tmp&= ~OPTION_FOUND_ROWS;