fix for char index

ha_mroonga.cpp

@@ -9618,6 +9618,13 @@ int ha_mroonga::storage_encode_key(Field *field, const uchar *key,
     break;
 #endif
   case MYSQL_TYPE_STRING:
+    {
+      const char *val = (const char *)ptr;
+      int len = strlen(val);
+      memcpy(buf, val, len);
+      *size = len;
+      break;
+    }
   case MYSQL_TYPE_VARCHAR:
   case MYSQL_TYPE_BLOB:
     {

test/sql/suite/mroonga/storage/index/primary/r/char.result

@@ -0,0 +1,9 @@
+drop table if exists t1;
+create table t1 (c1 char(10) primary key);
+insert into t1 values('abcdefghij');
+insert into t1 values('klmnopqrst');
+insert into t1 values('uvwxyz0123');
+select c1 from t1 force index(PRIMARY) where c1 = 'abcdefghij';
+c1
+abcdefghij
+drop table t1;

test/sql/suite/mroonga/storage/index/primary/t/char.test

@@ -0,0 +1,30 @@
+# Copyright(C) 2012 Kentoku SHIBA
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+--source include/have_mroonga.inc
+
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
+create table t1 (c1 char(10) primary key);
+insert into t1 values('abcdefghij');
+insert into t1 values('klmnopqrst');
+insert into t1 values('uvwxyz0123');
+select c1 from t1 force index(PRIMARY) where c1 = 'abcdefghij';
+drop table t1;
+
+--source include/have_mroonga_deinit.inc