Add bdb_version variable, and a new test.

mysql-test/r/bdb.result:
  Test key on blob containing null values.
mysql-test/t/bdb.test:
  Test key on blob containing null values.
sql/mysqld.cc:
  Add bdb_version variable
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

 jani@hynda.mysql.fi
 monty@donna.mysql.com
+tim@donna.mysql.com

mysql-test/r/bdb.result

@@ -406,3 +406,10 @@ a
 1
 2
 3
+b
+this is a blob
+b	i
+this is a blob	1
+b	i
+this is a blob	1
+b	i

mysql-test/t/bdb.test

@@ -334,3 +334,13 @@ CREATE TABLE t1 (a int not null, primary key (a)) type=bdb;
 insert into t1 values(1),(2),(3);
 select t1.a from t1 natural join t1 as t2 order by t1.a;
 drop table t1;
+
+#
+# Test key on blob with null values
+#
+create table t1 (b blob, i int, key (b(100)), key (i), key (i, b(20)));
+insert into t1 values ('this is a blob', 1), (null, -1), (null, null);
+select b from t1 where b = 'this is a blob';
+select * from t1 where b like 't%';
+select b, i from t1 where b is not null;
+select * from t1 where b is null and i > 0;

sql/mysqld.cc

@@ -2634,6 +2634,7 @@ struct show_var_st init_vars[]= {
   {"bdb_logdir",              (char*) &berkeley_logdir,             SHOW_CHAR_PTR},
   {"bdb_shared_data",	      (char*) &berkeley_shared_data,	    SHOW_BOOL},
   {"bdb_tmpdir",              (char*) &berkeley_tmpdir,             SHOW_CHAR_PTR},
+  {"bdb_version",             (char*) DB_VERSION_STRING,            SHOW_CHAR},
 #endif
   {"binlog_cache_size",       (char*) &binlog_cache_size,	    SHOW_LONG},
   {"character_set",           default_charset,                      SHOW_CHAR},