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create table t1 (pk int primary key);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
select * from t1 order by now(), cast(pk as char(0));
pk
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show warnings;
Level Code Message
Warning 1292 Truncated incorrect CHAR(0) value: '1'
Warning 1292 Truncated incorrect CHAR(0) value: '2'
Warning 1292 Truncated incorrect CHAR(0) value: '3'
Warning 1292 Truncated incorrect CHAR(0) value: '4'
Warning 1292 Truncated incorrect CHAR(0) value: '5'
Warning 1292 Truncated incorrect CHAR(0) value: '6'
Warning 1292 Truncated incorrect CHAR(0) value: '7'
Warning 1292 Truncated incorrect CHAR(0) value: '8'
Warning 1292 Truncated incorrect CHAR(0) value: '9'
Warning 1292 Truncated incorrect CHAR(0) value: '10'
drop table t1;
#
# MDEV-17020: Assertion `length > 0' failed in ptr_compare upon ORDER BY with bad conversion
#
set @save_sql_mode= @@sql_mode;
SET @@sql_mode= '';
CREATE TABLE t1 (pk INT PRIMARY KEY);
INSERT INTO t1 VALUES (1),(2);
explain
SELECT * FROM t1 ORDER BY 'foo', CONVERT(pk, CHAR(0)) LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 2 Using index; Using filesort
SELECT * FROM t1 ORDER BY 'foo', Cast(pk as CHAR(0)) LIMIT 2;
pk
1
2
Warnings:
Warning 1292 Truncated incorrect CHAR(0) value: '1'
Warning 1292 Truncated incorrect CHAR(0) value: '2'
set @@sql_mode= @save_sql_mode;
drop table t1;
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