Task 430: Allowing braces in joins by simply removing them.

This is a simple fix, allowing a join_table_list in the right reduction of a
normal_join sequence, instead of just a join_table. This makes things like
"t1, (t2 left join t3)" work, but it also allows "join" and "cross join" instead
of ",".

This should fix the bug reported as:
  Subject: ODBC SQL syntax issue 
  From: Ivan Vazharov 
  Date: Mon, 30 Sep 2002 12:02:42 +0200 

BitKeeper/etc/logging_ok

@@ -85,3 +85,4 @@ zgreant@mysql.com
 tfr@beta.frontier86.ee
 Administrador@light.
 mwagner@work.mysql.com
+pem@mysql.com

mysql-test/r/select.result

@@ -3266,3 +3266,30 @@ select wss_type from t1 where wss_type =102935229216544093;
 wss_type
 102935229216544093
 drop table t1;
+create table t1 (a int not null auto_increment primary key);
+insert into t1 values ();
+insert into t1 values ();
+insert into t1 values ();
+select * from (t1 as t2 left join t1 as t3 using (a)), t1;
+a	a	a
+1	1	1
+2	2	1
+3	3	1
+1	1	2
+2	2	2
+3	3	2
+1	1	3
+2	2	3
+3	3	3
+select * from t1, (t1 as t2 left join t1 as t3 using (a));
+a	a	a
+1	1	1
+2	1	1
+3	1	1
+1	2	2
+2	2	2
+3	2	2
+1	3	3
+2	3	3
+3	3	3
+drop table t1;

mysql-test/t/select.test

@@ -1751,3 +1751,16 @@ select wss_type from t1 where wss_type ='102935229216544104';
 select wss_type from t1 where wss_type ='102935229216544093';
 select wss_type from t1 where wss_type =102935229216544093;
 drop table t1;
+
+#
+# Test of removing redundant braces in the FROM part
+# (The second case used to cause a syntax error)
+#
+
+create table t1 (a int not null auto_increment primary key);
+insert into t1 values ();
+insert into t1 values ();
+insert into t1 values ();
+select * from (t1 as t2 left join t1 as t3 using (a)), t1;
+select * from t1, (t1 as t2 left join t1 as t3 using (a));
+drop table t1;

sql/sql_yacc.yy

@@ -2026,7 +2026,7 @@ opt_pad:
 join_table_list:
 	'(' join_table_list ')'	{ $$=$2; }
 	| join_table		{ $$=$1; }
-	| join_table_list normal_join join_table { $$=$3; }
+	| join_table_list normal_join join_table_list { $$=$3; }
 	| join_table_list STRAIGHT_JOIN join_table { $$=$3 ; $$->straight=1; }
 	| join_table_list INNER_SYM JOIN_SYM join_table ON expr
 	  { add_join_on($4,$6); $$=$4; }
@@ -3307,6 +3307,7 @@ option_value:
 	  {
 	    Lex->var_list.push_back(new set_var_password($3,$5));
 	  }
+	;
 
 internal_variable_name:
 	ident
@@ -3316,6 +3317,7 @@ internal_variable_name:
 	    YYABORT;
 	  $$=tmp;
 	}
+	;
 
 isolation_types:
 	READ_SYM UNCOMMITTED_SYM	{ $$= ISO_READ_UNCOMMITTED; }
@@ -3674,6 +3676,7 @@ require_clause: /* empty */
 	  {
 	    Lex->ssl_type=SSL_TYPE_NONE;
 	  }
+	;
 
 grant_options:
 	/* empty */ {}