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MDEV-22830: SQL_CALC_FOUND_ROWS not working properly for single SELECT for DUAL

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In case of SELECT without tables which returns either 0 or 1 rows,
JOIN::exec_inner() did not check if the flag representing SQL_CALC_FOUND_ROWS
is set or not and send_records was direclty assigned 0. So SELECT FOUND_ROWS()
was giving 0 in the output. Now it checks if the flag is set, if it is set
send_record=1 else 0. 1 is the number of rows that could have been sent
to the client if the SELECT query had SQL_CALC_FOUND_ROWS.
It is 0 when no rows were sent because the SELECT query did not have
SQL_CALC_FOUND_ROWS.
This commit is contained in:
rucha174 2020-06-09 01:35:39 +05:30
parent e1045a768b
commit 443391236d
3 changed files with 13 additions and 1 deletions
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5
mysql-test/r/select_found.result
View file

@ -362,4 +362,9 @@ c1
select found_rows();
found_rows()
5
SELECT SQL_CALC_FOUND_ROWS 1 FROM DUAL WHERE 0;
1
SELECT FOUND_ROWS();
FOUND_ROWS()
1
drop table t1;

7
mysql-test/t/select_found.test
View file

@ -286,4 +286,11 @@ select * from t1 order by c1 limit 2,1;
select found_rows();
select sql_calc_found_rows * from t1 order by c1 limit 2,1;
select found_rows();
#
# MDEV-22830 SQL_CALC_FOUND_ROWS not working properly for single SELECT for DUAL
#
SELECT SQL_CALC_FOUND_ROWS 1 FROM DUAL WHERE 0;
SELECT FOUND_ROWS();
drop table t1;

2
sql/sql_select.cc
View file

@ -2647,7 +2647,7 @@ void JOIN::exec_inner()
thd->get_sent_row_count());
}
else
send_records= 0;
send_records= (select_options & OPTION_FOUND_ROWS) ? 1 : 0;
if (!error)
{
join_free(); // Unlock all cursors