Mark that strings may change on index only reads (for BDB tables).

This fixed problem with index reads on character fields with BDB tables. (Bug #2509)

.bzrignore

@@ -541,3 +541,4 @@ libmysql_r/vio_priv.h
 hardcopy.0
 scripts/make_sharedlib_distribution
 sql/udf_example.so
+man/*.1

mysql-test/r/bdb.result

@@ -1165,3 +1165,28 @@ create table t2 (c char(8) not null, b char(8) not null, a char(8) not null, pri
 insert into t2 select * from t1;
 delete t1,t2 from t2,t1 where t1.a<'B' and t2.b=t1.b;
 drop table t1,t2;
+create table t1 (a char(10), key(a), b int not null, key(b)) engine=bdb;
+insert into t1 values ('a',1),('A',2);
+explain select a from t1;
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	ALL	NULL	NULL	NULL	NULL	2	
+select a from t1;
+a
+a
+A
+explain select b from t1;
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	index	NULL	b	4	NULL	2	Using index
+select b from t1;
+b
+1
+2
+alter table t1 modify a char(10) binary;
+explain select a from t1;
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	index	NULL	a	11	NULL	2	Using index
+select a from t1;
+a
+A
+a
+drop table t1;

mysql-test/r/myisam.result

@@ -386,7 +386,10 @@ Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 drop table t1;
 create table t1 ( a text not null, key a (a(20)));
-insert into t1 values ('aaa   '),('aaa');
+insert into t1 values ('aaa   '),('aaa'),('aa');
+check table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
 repair table t1;
 Table	Op	Msg_type	Msg_text
 test.t1	repair	status	OK
@@ -394,6 +397,15 @@ select concat(a,'.') from t1 where a='aaa';
 concat(a,'.')
 aaa.
 aaa   .
+select concat(a,'.') from t1 where binary a='aaa';
+concat(a,'.')
+aaa.
+update t1 set a='bbb' where a='aaa';
+select concat(a,'.') from t1;
+concat(a,'.')
+bbb.
+bbb.
+aa.
 drop table t1;
 create table t1(a text not null, b text not null, c text not null, index (a(10),b(10),c(10)));
 insert into t1 values('807780', '477', '165');
@@ -403,3 +415,19 @@ select * from t1 where a='807780' and b='477' and c='165';
 a	b	c
 807780	477	165
 drop table t1;
+create table t1 (a int not null auto_increment primary key, b text not null, unique b (b(20)));
+insert into t1 (b) values ('a'),('a '),('a  ');
+select concat(b,'.') from t1;
+concat(b,'.')
+a.
+a .
+a  .
+update t1 set b='b ' where a=2;
+update t1 set b='b  ' where a > 1;
+Duplicate entry 'b  ' for key 2
+delete from t1 where b='b';
+select a,concat(b,'.') from t1;
+a	concat(b,'.')
+1	a.
+3	a  .
+drop table t1;

mysql-test/t/bdb.test

@@ -815,3 +815,17 @@ insert into t2 select * from t1;
 
 delete t1,t2 from t2,t1 where t1.a<'B' and t2.b=t1.b;
 drop table t1,t2;
+
+#
+# Test index only read (Bug #2509)
+#
+create table t1 (a char(10), key(a), b int not null, key(b)) engine=bdb;
+insert into t1 values ('a',1),('A',2);
+explain select a from t1;
+select a from t1;
+explain select b from t1;
+select b from t1;
+alter table t1 modify a char(10) binary;
+explain select a from t1;
+select a from t1;
+drop table t1;

mysql-test/t/myisam.test

@@ -390,9 +390,13 @@ drop table t1;
 # two bugs in myisam-space-stripping feature
 #
 create table t1 ( a text not null, key a (a(20)));
-insert into t1 values ('aaa   '),('aaa');
+insert into t1 values ('aaa   '),('aaa'),('aa');
+check table t1;
 repair table t1;
 select concat(a,'.') from t1 where a='aaa';
+select concat(a,'.') from t1 where binary a='aaa';
+update t1 set a='bbb' where a='aaa';
+select concat(a,'.') from t1;
 drop table t1;
 
 #
@@ -406,3 +410,15 @@ insert into t1 values('807780', '472', '162');
 select * from t1 where a='807780' and b='477' and c='165';
 drop table t1;
 
+#
+# Test text and unique
+#
+create table t1 (a int not null auto_increment primary key, b text not null, unique b (b(20)));
+insert into t1 (b) values ('a'),('a '),('a  ');
+select concat(b,'.') from t1;
+update t1 set b='b ' where a=2;
+--error 1062
+update t1 set b='b  ' where a > 1;
+delete from t1 where b='b';
+select a,concat(b,'.') from t1;
+drop table t1;

sql/ha_berkeley.h

@@ -92,7 +92,7 @@ class ha_berkeley: public handler
 		    HA_NULL_KEY | HA_BLOB_KEY | HA_NOT_EXACT_COUNT |
 		    HA_PRIMARY_KEY_IN_READ_INDEX | HA_DROP_BEFORE_CREATE |
 		    HA_AUTO_PART_KEY | HA_TABLE_SCAN_ON_INDEX |
-		    HA_FILE_BASED),
+		    HA_KEY_READ_WRONG_STR | HA_FILE_BASED),
     changed_rows(0),last_dup_key((uint) -1),version(0),using_ignore(0)
   {
   }

sql/item_strfunc.cc

@@ -1507,14 +1507,11 @@ void Item_func_elt::fix_length_and_dec()
 {
   max_length=0;
   decimals=0;
-  /*
-    first numeric argument isn't in args (3.23 and 4.0)
-    but since 4.1 the cycle should start from 1
-    so this change 
-    
-    should NOT be merged into 4.1!!!
-  */
+#if MYSQL_VERSION_ID < 40100
   for (uint i= 0; i < arg_count ; i++)
+#else
+  for (uint i= 1; i < arg_count ; i++)
+#endif
   {
     set_if_bigger(max_length,args[i]->max_length);
     set_if_bigger(decimals,args[i]->decimals);

sql/table.cc

@@ -498,7 +498,8 @@ int openfrm(const char *name, const char *alias, uint db_stat, uint prgflag,
 	      field->type() != FIELD_TYPE_BLOB)
 	  {
 	    if (field->key_type() != HA_KEYTYPE_TEXT ||
-		(!(ha_option & HA_KEY_READ_WRONG_STR) &&
+		((!(ha_option & HA_KEY_READ_WRONG_STR) ||
+		  field->flags & BINARY_FLAG) &&
 		 !(keyinfo->flags & HA_FULLTEXT)))
 	      field->part_of_key|= ((key_map) 1 << key);
 	    if ((field->key_type() != HA_KEYTYPE_TEXT ||