Bug #5832 SELECT doesn't return records in some cases

mysql-test/r/bdb.result

@@ -1260,3 +1260,27 @@ a	length(a)	char_length(a)
 ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ	510	255
 drop table t1;
 SET NAMES latin1;
+CREATE TABLE t1 (
+id       int unsigned NOT NULL auto_increment,
+list_id  smallint unsigned NOT NULL,
+term     TEXT NOT NULL,
+PRIMARY KEY(id),
+INDEX(list_id, term(4))
+) ENGINE=BDB CHARSET=utf8;
+INSERT INTO t1 SET list_id = 1, term = "letterc";
+INSERT INTO t1 SET list_id = 1, term = "letterb";
+INSERT INTO t1 SET list_id = 1, term = "lettera";
+INSERT INTO t1 SET list_id = 1, term = "letterd";
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterc");
+id
+1
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterb");
+id
+2
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "lettera");
+id
+3
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterd");
+id
+4
+DROP TABLE t1;

mysql-test/r/ctype_utf8.result

@@ -726,3 +726,27 @@ length(subject)
 3
 432
 DROP TABLE t1;
+CREATE TABLE t1 (
+id       int unsigned NOT NULL auto_increment,
+list_id  smallint unsigned NOT NULL,
+term     TEXT NOT NULL,
+PRIMARY KEY(id),
+INDEX(list_id, term(4))
+) ENGINE=MYISAM CHARSET=utf8;
+INSERT INTO t1 SET list_id = 1, term = "letterc";
+INSERT INTO t1 SET list_id = 1, term = "letterb";
+INSERT INTO t1 SET list_id = 1, term = "lettera";
+INSERT INTO t1 SET list_id = 1, term = "letterd";
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterc");
+id
+1
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterb");
+id
+2
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "lettera");
+id
+3
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterd");
+id
+4
+DROP TABLE t1;

mysql-test/t/bdb.test

@@ -909,3 +909,23 @@ insert into t1 values (@a);
 select a, length(a), char_length(a) from t1;
 drop table t1;
 SET NAMES latin1;
+
+#
+# Bug #5832 SELECT doesn't return records in some cases
+#
+CREATE TABLE t1 (
+    id       int unsigned NOT NULL auto_increment,
+    list_id  smallint unsigned NOT NULL,
+    term     TEXT NOT NULL,
+    PRIMARY KEY(id),
+    INDEX(list_id, term(4))
+) ENGINE=BDB CHARSET=utf8;
+INSERT INTO t1 SET list_id = 1, term = "letterc";
+INSERT INTO t1 SET list_id = 1, term = "letterb";
+INSERT INTO t1 SET list_id = 1, term = "lettera";
+INSERT INTO t1 SET list_id = 1, term = "letterd";
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterc");
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterb");
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "lettera");
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterd");
+DROP TABLE t1;

mysql-test/t/ctype_utf8.test

@@ -572,3 +572,23 @@ INSERT INTO t1 VALUES ('aaa','bbb');
 SELECT length(subject) FROM t1;
 SELECT length(subject) FROM t1 ORDER BY 1;
 DROP TABLE t1;
+
+#
+# Bug #5832 SELECT doesn't return records in some cases
+#
+CREATE TABLE t1 (
+    id       int unsigned NOT NULL auto_increment,
+    list_id  smallint unsigned NOT NULL,
+    term     TEXT NOT NULL,
+    PRIMARY KEY(id),
+    INDEX(list_id, term(4))
+) ENGINE=MYISAM CHARSET=utf8;
+INSERT INTO t1 SET list_id = 1, term = "letterc";
+INSERT INTO t1 SET list_id = 1, term = "letterb";
+INSERT INTO t1 SET list_id = 1, term = "lettera";
+INSERT INTO t1 SET list_id = 1, term = "letterd";
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterc");
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterb");
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "lettera");
+SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterd");
+DROP TABLE t1;

sql/field.cc

@@ -5077,6 +5077,11 @@ void Field_blob::get_key_image(char *buff,uint length,
   }
 #endif /*HAVE_SPATIAL*/
 
+  get_ptr(&blob);
+  uint char_length= length / cs->mbmaxlen;
+  char_length= my_charpos(cs, blob, blob + length, char_length);
+  set_if_smaller(length, char_length);
+
   if ((uint32) length > blob_length)
   {
     /*
@@ -5087,7 +5092,6 @@ void Field_blob::get_key_image(char *buff,uint length,
     length=(uint) blob_length;
   }
   int2store(buff,length);
-  get_ptr(&blob);
   memcpy(buff+HA_KEY_BLOB_LENGTH, blob, length);
 }
 
@@ -5103,6 +5107,10 @@ int Field_blob::key_cmp(const byte *key_ptr, uint max_key_length)
   char *blob1;
   uint blob_length=get_length(ptr);
   memcpy_fixed(&blob1,ptr+packlength,sizeof(char*));
+  CHARSET_INFO *cs= charset();
+  uint char_length= max_key_length / cs->mbmaxlen;
+  char_length= my_charpos(cs, blob1, blob1+blob_length, char_length);
+  set_if_smaller(blob_length, char_length);
   return Field_blob::cmp(blob1,min(blob_length, max_key_length),
 			 (char*) key_ptr+HA_KEY_BLOB_LENGTH,
 			 uint2korr(key_ptr));