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fix for SQL_CALC_FOUND_ROWS in UNION's

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Sinisa@sinisa.nasamreza.org 2002-04-03 17:52:31 +03:00
parent fd7b04ad74
commit 34998c5ad4
4 changed files with 17 additions and 1 deletions
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4
Docs/manual.texi
View File

@ -48946,6 +48946,10 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.
@itemize @bullet
@item
fixed that SQL_CALC_FOUND_ROWS works with UNIONs. It will work only if first
select has this option and if there is global LIMIT for entire select. For the
moment this requires using braces for individual select's.
@item
Don't give an error for @code{CREATE TABLE ...(... VARCHAR(0))}.
@item
Fixed @code{SIGINT} and @code{SIGQUIT} problems in @file{mysql.cc} on Linux

7
mysql-test/r/union.result
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@ -89,6 +89,13 @@ table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
t2 ALL NULL NULL NULL NULL 4 Using filesort
t1 ALL NULL NULL NULL NULL 4
(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
a b
1 a
2 b
select found_rows();
FOUND_ROWS()
6
explain select a,b from t1 union all select a,b from t2;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4

3
mysql-test/t/union.test
View File

@ -21,7 +21,8 @@ select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 g
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1);
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
select found_rows();
# Test some error conditions with UNION
explain select a,b from t1 union all select a,b from t2;

4
sql/sql_union.cc
View File

@ -33,6 +33,7 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
TABLE *table;
int describe=(lex->select_lex.options & SELECT_DESCRIBE) ? 1 : 0;
int res;
bool fr=false;
TABLE_LIST result_table_list;
TABLE_LIST *first_table=(TABLE_LIST *)lex->select_lex.table_list.first;
TMP_TABLE_PARAM tmp_table_param;
@ -60,6 +61,7 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
*/
lex_sl= sl;
order= (ORDER *) lex_sl->order_list.first;
fr = lex->select_lex.options & OPTION_FOUND_ROWS && !describe && sl->select_limit && sl->select_limit != HA_POS_ERROR;
if (!order || !describe)
last_sl->next=0; // Remove this extra element
}
@ -198,6 +200,8 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
item_list, NULL, (describe) ? 0 : order,
(ORDER*) NULL, NULL, (ORDER*) NULL,
thd->options, result);
if (fr && !res)
thd->limit_found_rows = (ulonglong)table->file->records;
}
}