fixed bug of unchecked random part of WHERE clause (bug #142)

mysql-test/r/select.result:
  test of random WHERE clause
mysql-test/t/select.test:
  test of random WHERE clause
sql/sql_select.cc:
  fixed bug of unchecked random part of WHERE clause

mysql-test/r/select.result

@@ -1793,3 +1793,4 @@ Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_par
 t2	0	PRIMARY	1	auto	A	1199	NULL	NULL	
 t2	0	fld1	1	fld1	A	1199	NULL	NULL	
 t2	1	fld3	1	fld3	A	NULL	NULL	NULL	
+1

mysql-test/t/select.test

@@ -1712,8 +1712,23 @@ show full columns from t2 from test like 'f%';
 show full columns from t2 from test like 's%';
 show keys from t2;
 
+#
+# random in WHERE clause
+#
+
+drop table t1;
+CREATE TABLE t1 (
+  id mediumint(8) unsigned NOT NULL auto_increment,
+  pseudo varchar(35) NOT NULL default '',
+  PRIMARY KEY  (id),
+  UNIQUE KEY pseudo (pseudo)
+);
+INSERT INTO t1 (pseudo) VALUES ('test');
+INSERT INTO t1 (pseudo) VALUES ('test1');
+SELECT 1 from t1 where rand() > 2;
+
 #
 # Drop the test tables
 #
 
-drop table t4, t3,t2, t1;
+drop table t4, t3, t2, t1;

sql/sql_select.cc

@@ -2257,6 +2257,8 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
     {
       JOIN_TAB *tab=join->join_tab+i;
       table_map current_map= tab->table->map;
+      if (i == join->tables-1)
+	current_map|= RAND_TABLE_BIT;
       bool use_quick_range=0;
       used_tables|=current_map;