MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found

mysql-test/include/ctype_common.inc

@@ -64,6 +64,14 @@ select a sounds like a from t1;
 select 1 from t1 order by cast(a as char(1));
 drop table t1;
 
+--echo #
+--echo # MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+--echo #
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+
 #
 # Bug#27580 SPACE() function collation bug?
 #

mysql-test/r/ctype_big5.result

@@ -71,6 +71,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+big5_chinese_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/r/ctype_cp1250_ch.result

@@ -75,6 +75,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+cp1250_general_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),
@@ -168,6 +177,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+cp1250_czech_cs	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/r/ctype_euckr.result

@@ -71,6 +71,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+euckr_korean_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/r/ctype_gb2312.result

@@ -71,6 +71,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+gb2312_chinese_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/r/ctype_gbk.result

@@ -71,6 +71,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+gbk_chinese_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/r/ctype_latin1.result

@@ -308,6 +308,108 @@ select 'a' regexp 'A' collate latin1_general_cs;
 select 'a' regexp 'A' collate latin1_bin;
 'a' regexp 'A' collate latin1_bin
 0
+SET @test_character_set= 'latin1';
+SET @test_collation= 'latin1_swedish_ci';
+SET @safe_character_set_server= @@character_set_server;
+SET @safe_collation_server= @@collation_server;
+SET @safe_character_set_client= @@character_set_client;
+SET @safe_character_set_results= @@character_set_results;
+SET character_set_server= @test_character_set;
+SET collation_server= @test_collation;
+CREATE DATABASE d1;
+USE d1;
+CREATE TABLE t1 (c CHAR(10), KEY(c));
+SHOW FULL COLUMNS FROM t1;
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+c	char(10)	latin1_swedish_ci	YES	MUL	NULL			
+INSERT INTO t1 VALUES ('aaa'),('aaaa'),('aaaaa');
+SELECT c as want3results FROM t1 WHERE c LIKE 'aaa%';
+want3results
+aaa
+aaaa
+aaaaa
+DROP TABLE t1;
+CREATE TABLE t1 (c1 varchar(15), KEY c1 (c1(2)));
+SHOW FULL COLUMNS FROM t1;
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+c1	varchar(15)	latin1_swedish_ci	YES	MUL	NULL			
+INSERT INTO t1 VALUES ('location'),('loberge'),('lotre'),('boabab');
+SELECT c1 as want3results from t1 where c1 like 'l%';
+want3results
+location
+loberge
+lotre
+SELECT c1 as want3results from t1 where c1 like 'lo%';
+want3results
+location
+loberge
+lotre
+SELECT c1 as want1result  from t1 where c1 like 'loc%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'loca%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'locat%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'locati%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'locatio%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'location%';
+want1result
+location
+DROP TABLE t1;
+create table t1 (a set('a') not null);
+insert into t1 values (),();
+Warnings:
+Warning	1364	Field 'a' doesn't have a default value
+select cast(a as char(1)) from t1;
+cast(a as char(1))
+
+
+select a sounds like a from t1;
+a sounds like a
+1
+1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
+drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+latin1_swedish_ci	.wwwmysqlcom
+set names utf8;
+create table t1 (
+name varchar(10),
+level smallint unsigned);
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `name` varchar(10) DEFAULT NULL,
+  `level` smallint(5) unsigned DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values ('string',1);
+select concat(name,space(level)), concat(name, repeat(' ',level)) from t1;
+concat(name,space(level))	concat(name, repeat(' ',level))
+string 	string 
+drop table t1;
+DROP DATABASE d1;
+USE test;
+SET character_set_server= @safe_character_set_server;
+SET collation_server= @safe_collation_server;
+SET character_set_client= @safe_character_set_client;
+SET character_set_results= @safe_character_set_results;
 SET collation_connection='latin1_swedish_ci';
 create table t1 select repeat('a',4000) a;
 delete from t1;

mysql-test/r/ctype_uca.result

@@ -2725,6 +2725,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+utf8_swedish_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/r/ctype_ucs.result

@@ -71,6 +71,15 @@ select 1 from t1 order by cast(a as char(1));
 1
 1
 drop table t1;
+#
+# MDEV-6134 SUBSTRING_INDEX returns wrong result for 8bit character sets when delimiter is not found
+#
+SET character_set_client=latin1;
+SET character_set_connection= @test_character_set;
+SET collation_connection= @test_collation;
+SELECT COLLATION('.'), SUBSTRING_INDEX('.wwwmysqlcom', '.', -2) AS c1;
+COLLATION('.')	c1
+ucs2_general_ci	.wwwmysqlcom
 set names utf8;
 create table t1 (
 name varchar(10),

mysql-test/t/ctype_latin1.test

@@ -79,6 +79,10 @@ select 'a' regexp 'A' collate latin1_general_cs;
 select 'a' regexp 'A' collate latin1_bin;
 
 
+SET @test_character_set= 'latin1';
+SET @test_collation= 'latin1_swedish_ci';
+-- source include/ctype_common.inc
+
 SET collation_connection='latin1_swedish_ci';
 -- source include/ctype_filesort.inc
 -- source include/ctype_like_escape.inc

sql/item_strfunc.cc

@@ -1404,6 +1404,8 @@ String *Item_func_substr_index::val_str(String *str)
 	  break;
 	}
       }
+      if (count)
+        return res;                     // Didn't find, return org string
     }
   }
   /*