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The problem was due to a prior fix for BUG 9676, which limited the rows stored in a temporary table to the LIMIT clause. This optimization is not applicable to non-group queries with aggregate functions. The fix disables the optimization in this case. mysql-test/r/limit.result: Test case for BUG#21787 mysql-test/t/limit.test: Test case for BUG#21787 sql/sql_select.cc: If there is an aggregate function in a non-group query, materialize all rows in the temporary table no matter if there is a LIMIT clause. This is necessary, since the aggregate functions must be computed over all result rows, not just the first LIMIT rows.
73 lines
1.9 KiB
Text
73 lines
1.9 KiB
Text
#
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# Test of update and delete with limit
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#
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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create table t1 (a int primary key, b int not null);
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insert into t1 () values (); -- Testing default values
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insert into t1 values (1,1),(2,1),(3,1);
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update t1 set a=4 where b=1 limit 1;
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select * from t1;
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update t1 set b=2 where b=1 limit 2;
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select * from t1;
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update t1 set b=4 where b=1;
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select * from t1;
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delete from t1 where b=2 limit 1;
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select * from t1;
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delete from t1 limit 1;
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select * from t1;
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drop table t1;
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create table t1 (i int);
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insert into t1 (i) values(1),(1),(1);
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delete from t1 limit 1;
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update t1 set i=2 limit 1;
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delete from t1 limit 0;
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update t1 set i=3 limit 0;
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select * from t1;
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drop table t1;
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# LIMIT 0
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select 0 limit 0;
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#
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# Test with DELETE, ORDER BY and limit (bug #1024)
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#
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CREATE TABLE t1(id int auto_increment primary key, id2 int, index(id2));
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INSERT INTO t1 (id2) values (0),(0),(0);
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DELETE FROM t1 WHERE id=1;
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INSERT INTO t1 SET id2=0;
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SELECT * FROM t1;
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DELETE FROM t1 WHERE id2 = 0 ORDER BY id LIMIT 1;
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# should have deleted WHERE id=2
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SELECT * FROM t1;
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DELETE FROM t1 WHERE id2 = 0 ORDER BY id desc LIMIT 1;
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SELECT * FROM t1;
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DROP TABLE t1;
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#
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# Bug#8023 - limit on UNION with from DUAL, causes syntax error
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#
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create table t1 (a integer);
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insert into t1 values (1);
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# both queries must return one row
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select 1 as a from t1 union all select 1 from dual limit 1;
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(select 1 as a from t1) union all (select 1 from dual) limit 1;
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drop table t1;
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#
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# Bug #21787: COUNT(*) + ORDER BY + LIMIT returns wrong result
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#
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create table t1 (a int);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7);
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explain select count(*) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 3;
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select count(*) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 3;
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explain select sum(a) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 3;
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select sum(a) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 3;
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# End of 4.1 tests
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