Fixed bug in GROUP BY ... DESC

Docs/manual.texi:
  Changelog
libmysql/libmysql.c:
  Fixed bug with mysql_use_result() when mysql_query() is called before mysql_free_result().
mysql-test/r/group_by.result:
  New tests
mysql-test/t/group_by.test:
  New tests
sql/stacktrace.c:
  Fix for SCO

Docs/manual.texi

@@ -46839,6 +46839,8 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.47
 @itemize @bullet
 @item
+Fixed that @code{GROUP BY expr DESC} works.
+@item
 Fixed bug when using @code{t1 LEFT JOIN t2 ON t2.key=constant}.
 @item
 @code{mysqlconfig} now also work with binary (relocated) distributions.

libmysql/libmysql.c

@@ -1955,6 +1955,8 @@ mysql_fetch_row(MYSQL_RES *res)
 	DBUG_PRINT("info",("end of data"));
 	res->eof=1;
 	res->handle->status=MYSQL_STATUS_READY;
+	/* Don't clear handle in mysql_free_results */
+	res->handle=0;
       }
     }
     DBUG_RETURN((MYSQL_ROW) NULL);

mysql-test/r/group_by.result

@@ -34,3 +34,33 @@ Test Procedures		0
 2	a	0
 1+1	a	count(*)
 2	a	0
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
+userid	count(*)
+3	3
+2	1
+1	2
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	range	spID	spID	5	NULL	2	where used; Using index; Using temporary
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	range	spID	spID	5	NULL	2	where used; Using index
+spid	count(*)
+1	1
+2	2
+spid	count(*)
+2	2
+1	1
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	ALL	NULL	NULL	NULL	NULL	6	Using filesort
+spid	sum(userid)
+5	3
+4	3
+3	3
+2	3
+1	1
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t1	index	NULL	score	3	NULL	6	Using index
+score	count(*)
+3	3
+2	1
+1	2

mysql-test/t/group_by.test

@@ -38,7 +38,6 @@ INSERT INTO t2 VALUES (3,'name','pass','mail','Y','v','n','adr','1','1','1');
 SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid;
 SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2  GROUP BY t2.userid;
 SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2  GROUP BY t2.userid;
-
 drop table test.t1,test.t2;
 
 #
@@ -220,3 +219,27 @@ select 1+1, "a",count(*) from t1 where foo in (2);
 insert into t1 values (1);
 select 1+1,"a",count(*) from t1 where foo in (2);
 drop table t1;
+
+#
+# Test GROUP BY DESC
+
+CREATE TABLE t1 (
+  spID int(10) unsigned,
+  userID int(10) unsigned,
+  score smallint(5) unsigned,
+  key (spid),
+  key (score)
+);
+
+INSERT INTO t1 VALUES (1,1,1),(2,2,2),(2,1,1),(3,3,3),(4,3,3),(5,3,3);
+explain select userid,count(*) from t1 group by userid desc;
+select userid,count(*) from t1 group by userid desc;
+explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
+explain select spid,count(*) from t1 where spid between 1 and 2 group by spid;
+select spid,count(*) from t1 where spid between 1 and 2 group by spid;
+select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
+explain select sql_big_result spid,sum(userid) from t1 group by spid desc;
+select sql_big_result spid,sum(userid) from t1 group by spid desc;
+explain select sql_big_result score,count(*) from t1 group by score desc;
+select sql_big_result score,count(*) from t1 group by score desc;
+drop table t1;

sql/sql_lex.h

@@ -140,7 +140,7 @@ typedef struct st_lex {
   enum lex_states next_state;
   enum enum_duplicates duplicates;
   enum enum_tx_isolation tx_isolation;
-  uint in_sum_expr,grant,grant_tot_col,which_columns, sort_default;
+  uint in_sum_expr,grant,grant_tot_col,which_columns;
   thr_lock_type lock_option;
   bool	create_refs,drop_primary,drop_if_exists,local_file;
   bool  in_comment,ignore_space,verbose;

sql/sql_yacc.yy

@@ -470,7 +470,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 	ULONGLONG_NUM
 
 %type <item>
-	literal text_literal insert_ident group_ident order_ident
+	literal text_literal insert_ident order_ident
 	simple_ident select_item2 expr opt_expr opt_else sum_expr in_sum_expr
 	table_wild opt_pad no_in_expr expr_expr simple_expr no_and_expr
 	using_list
@@ -1869,10 +1869,10 @@ group_clause:
 	| GROUP BY group_list
 
 group_list:
-	group_list ',' group_ident
-	  { if (add_group_to_list($3,(bool) 1)) YYABORT; }
-	| group_ident
-	  { if (add_group_to_list($1,(bool) 1)) YYABORT; }
+	group_list ',' order_ident order_dir
+	  { if (add_group_to_list($3,(bool) $4)) YYABORT; }
+	| order_ident order_dir
+	  { if (add_group_to_list($1,(bool) $2)) YYABORT; }
 
 /*
 ** Order by statement in select
@@ -1883,7 +1883,7 @@ opt_order_clause:
 	| order_clause
 
 order_clause:
-	ORDER_SYM BY { Lex->sort_default=1; } order_list
+	ORDER_SYM BY order_list
 
 order_list:
 	order_list ',' order_ident order_dir
@@ -1893,8 +1893,8 @@ order_list:
 
 order_dir:
 	/* empty */ { $$ =  1; }
-	| ASC  { $$ = Lex->sort_default=1; }
-	| DESC { $$ = Lex->sort_default=0; }
+	| ASC  { $$ =1; }
+	| DESC { $$ =0; }
 
 
 limit_clause:
@@ -2452,9 +2452,6 @@ table_wild:
 	| ident '.' ident '.' '*'
 	{ $$ = new Item_field((current_thd->client_capabilities & CLIENT_NO_SCHEMA ? NullS : $1.str),$3.str,"*"); }
 
-group_ident:
-	order_ident order_dir
-
 order_ident:
 	expr { $$=$1; }
 

sql/stacktrace.c

@@ -218,7 +218,7 @@ void write_core(int sig)
 {
   signal(sig, SIG_DFL);
   pthread_kill(pthread_self(), sig);
-#if defined(P_MYID)
+#if defined(P_MYID) && !defined(SCO)
   /* On Solaris, the above kill is not enough */
   sigsend(P_PID,P_MYID,sig);
 #endif