Reverting patch for BUG #14009 (use of abs() on null value causes problems with filesort

Fix for bug #14536: SELECT @A,@A:=... fails with prepared statements

mysql-test/r/func_sapdb.result

@@ -180,8 +180,8 @@ Field	Type	Null	Key	Default	Extra
 f1	date	NO		0000-00-00	
 f2	datetime	YES		NULL	
 f3	time	YES		NULL	
-f4	time	NO		00:00:00	
-f5	time	NO		00:00:00	
+f4	time	YES		NULL	
+f5	time	YES		NULL	
 f6	time	NO		00:00:00	
 f7	datetime	YES		NULL	
 f8	date	YES		NULL	

mysql-test/r/type_newdecimal.result

@@ -176,7 +176,7 @@ Table	Create Table
 t1	CREATE TABLE `t1` (
   `round(15.4,-1)` decimal(3,0) unsigned NOT NULL default '0',
   `truncate(-5678.123451,-3)` decimal(4,0) NOT NULL default '0',
-  `abs(-1.1)` decimal(2,1) default NULL,
+  `abs(-1.1)` decimal(2,1) NOT NULL default '0.0',
   `-(-1.1)` decimal(2,1) NOT NULL default '0.0'
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;

mysql-test/r/user_var.result

@@ -123,6 +123,17 @@ select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
 0	1	1	0
 1	3	2	0
 3	6	3	0
+set @a=0;
+select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
+@a	@a:="hello"	@a	@a:=3	@a	@a:="hello again"
+0	hello	0	3	0	hello again
+0	hello	0	3	0	hello again
+0	hello	0	3	0	hello again
+select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
+@a	@a:="hello"	@a	@a:=3	@a	@a:="hello again"
+hello again	hello	hello again	3	hello again	hello again
+hello again	hello	hello again	3	hello again	hello again
+hello again	hello	hello again	3	hello again	hello again
 drop table t1;
 set @a=_latin2'test';
 select charset(@a),collation(@a),coercibility(@a);

mysql-test/t/disabled.def

@@ -16,4 +16,3 @@ rpl_until       : Unstable test case, bug#12429
 rpl_deadlock    : Unstable test case, bug#12429
 kill            : Unstable test case, bug#9712
 archive_gis     : The test fails on 32bit Linux
-user_var        : Ramil should fix this soon

mysql-test/t/user_var.test

@@ -70,6 +70,10 @@ create table t1 (i int not null);
 insert t1 values (1),(2),(2),(3),(3),(3);
 select @a:=0; select @a, @a:=@a+count(*), count(*), @a from t1 group by i;
 select @a:=0; select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
+
+set @a=0;
+select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
+select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
 drop table t1;
 
 #

sql/item.cc

@@ -5082,14 +5082,16 @@ bool Item_insert_value::fix_fields(THD *thd, Item **items)
 {
   DBUG_ASSERT(fixed == 0);
   /* We should only check that arg is in first table */
+  if (!arg->fixed)
+  {
+    bool res;
     st_table_list *orig_next_table= context->last_name_resolution_table;
     context->last_name_resolution_table= context->first_name_resolution_table;
-  if (!arg->fixed && arg->fix_fields(thd, &arg))
-  {
+    res= arg->fix_fields(thd, &arg);
     context->last_name_resolution_table= orig_next_table;
+    if (res)
       return TRUE;
   }
-  context->last_name_resolution_table= orig_next_table;
 
   if (arg->type() == REF_ITEM)
   {

sql/item_func.cc

@@ -636,7 +636,6 @@ void Item_func_num1::fix_num_length_and_dec()
 {
   decimals= args[0]->decimals;
   max_length= args[0]->max_length;
-  maybe_null= 1;
 }
 
 

sql/item_timefunc.h

@@ -845,6 +845,7 @@ class Item_func_timediff :public Item_str_func
   {
     decimals=0;
     max_length=MAX_TIME_WIDTH*MY_CHARSET_BIN_MB_MAXLEN;
+    maybe_null= 1;
   }
   Field *tmp_table_field(TABLE *t_arg)
   {

sql/sql_base.cc

@@ -37,7 +37,7 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
 			     TABLE_LIST *table_list, MEM_ROOT *mem_root);
 static void free_cache_entry(TABLE *entry);
 static void mysql_rm_tmp_tables(void);
-static my_bool open_new_frm(const char *path, const char *alias,
+static bool open_new_frm(THD *thd, const char *path, const char *alias,
                          const char *db, const char *table_name,
                          uint db_stat, uint prgflag,
                          uint ha_open_flags, TABLE *outparam,
@@ -1755,7 +1755,7 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
 		      thd->open_options, entry)) &&
       (error != 5 ||
        (fn_format(path, path, 0, reg_ext, MY_UNPACK_FILENAME),
-        open_new_frm(path, alias, db, name,
+        open_new_frm(thd, path, alias, db, name,
                      (uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE |
                              HA_GET_INDEX | HA_TRY_READ_ONLY),
                      READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
@@ -5260,6 +5260,7 @@ int init_ftfuncs(THD *thd, SELECT_LEX *select_lex, bool no_order)
 
   SYNOPSIS
     open_new_frm()
+    THD		  thread handler
     path	  path to .frm
     alias	  alias for table
     db            database
@@ -5273,8 +5274,8 @@ int init_ftfuncs(THD *thd, SELECT_LEX *select_lex, bool no_order)
     mem_root	  temporary MEM_ROOT for parsing
 */
 
-static my_bool
-open_new_frm(const char *path, const char *alias,
+static bool
+open_new_frm(THD *thd, const char *path, const char *alias,
              const char *db, const char *table_name,
              uint db_stat, uint prgflag,
 	     uint ha_open_flags, TABLE *outparam, TABLE_LIST *table_desc,
@@ -5296,7 +5297,7 @@ open_new_frm(const char *path, const char *alias,
         my_error(ER_WRONG_OBJECT, MYF(0), db, table_name, "BASE TABLE");
         goto err;
       }
-      if (mysql_make_view(parser, table_desc))
+      if (mysql_make_view(thd, parser, table_desc))
         goto err;
     }
     else

sql/sql_lex.h

@@ -361,7 +361,7 @@ class st_select_lex_node {
 
   friend class st_select_lex_unit;
   friend bool mysql_new_select(struct st_lex *lex, bool move_down);
-  friend my_bool mysql_make_view (File_parser *parser,
+  friend bool mysql_make_view(THD *thd, File_parser *parser,
                               TABLE_LIST *table);
 private:
   void fast_exclude();

sql/sql_select.cc

@@ -1237,7 +1237,8 @@ JOIN::exec()
 
   if (zero_result_cause)
   {
-    (void) return_zero_rows(this, result, select_lex->leaf_tables, *columns_list,
+    (void) return_zero_rows(this, result, select_lex->leaf_tables,
+                            *columns_list,
 			    send_row_on_empty_set(),
 			    select_options,
 			    zero_result_cause,
@@ -1671,7 +1672,8 @@ JOIN::exec()
   {
     thd->proc_info="Sending data";
     DBUG_PRINT("info", ("%s", thd->proc_info));
-    result->send_fields(*columns_list,
+    result->send_fields((procedure ? curr_join->procedure_fields_list :
+                         *curr_fields_list),
                         Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF);
     error= do_select(curr_join, curr_fields_list, NULL, procedure);
     thd->limit_found_rows= curr_join->send_records;
@@ -9023,7 +9025,6 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
   int rc= 0;
   enum_nested_loop_state error= NESTED_LOOP_OK;
   JOIN_TAB *join_tab;
-  List<Item> *columns_list= procedure? &join->procedure_fields_list : fields;
   DBUG_ENTER("do_select");
 
   join->procedure=procedure;
@@ -9057,8 +9058,12 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
 	error= (*end_select)(join,join_tab,1);
     }
     else if (join->send_row_on_empty_set())
+    {
+      List<Item> *columns_list= (procedure ? &join->procedure_fields_list :
+                                 fields);
       rc= join->result->send_data(*columns_list);
     }
+  }
   else
   {
     error= sub_select(join,join_tab,0);

sql/sql_view.cc

@@ -728,20 +728,24 @@ static int mysql_register_view(THD *thd, TABLE_LIST *view,
 
   SYNOPSIS
     mysql_make_view()
-    parser		- parser object;
-    table		- TABLE_LIST structure for filling
+    thd			Thread handler
+    parser		parser object
+    table		TABLE_LIST structure for filling
 
   RETURN
     0 ok
     1 error
 */
 
-my_bool
-mysql_make_view(File_parser *parser, TABLE_LIST *table)
+bool mysql_make_view(THD *thd, File_parser *parser, TABLE_LIST *table)
 {
-  THD *thd= current_thd;
+  SELECT_LEX *end, *view_select;
+  LEX *old_lex, *lex;
+  Query_arena *arena, backup;
+  int res;
+  bool result;
   DBUG_ENTER("mysql_make_view");
-  DBUG_PRINT("info", ("table=%p (%s)", table, table->table_name));
+  DBUG_PRINT("info", ("table: 0x%lx (%s)", (ulong) table, table->table_name));
 
   if (table->view)
   {
@@ -765,16 +769,12 @@ mysql_make_view(File_parser *parser, TABLE_LIST *table)
     DBUG_RETURN(0);
   }
 
-  SELECT_LEX *end;
-  LEX *old_lex= thd->lex, *lex;
-  SELECT_LEX *view_select;
-  int res= 0;
-
   /*
     For now we assume that tables will not be changed during PS life (it
     will be TRUE as far as we make new table cache).
   */
-  Query_arena *arena= thd->stmt_arena, backup;
+  old_lex= thd->lex;
+  arena= thd->stmt_arena;
   if (arena->is_conventional())
     arena= 0;
   else
@@ -1133,23 +1133,21 @@ mysql_make_view(File_parser *parser, TABLE_LIST *table)
     (st_select_lex_node**)&old_lex->all_selects_list;
 
 ok2:
-  if (arena)
-    thd->restore_active_arena(arena, &backup);
   if (!old_lex->time_zone_tables_used && thd->lex->time_zone_tables_used)
     old_lex->time_zone_tables_used= thd->lex->time_zone_tables_used;
-  thd->lex= old_lex;
-  if (!table->prelocking_placeholder && table->prepare_security(thd))
-    DBUG_RETURN(1);
-
-  DBUG_RETURN(0);
+  result= !table->prelocking_placeholder && table->prepare_security(thd);
 
-err:
+end:
   if (arena)
     thd->restore_active_arena(arena, &backup);
+  thd->lex= old_lex;
+  DBUG_RETURN(result);
+
+err:
   delete table->view;
   table->view= 0;	// now it is not VIEW placeholder
-  thd->lex= old_lex;
-  DBUG_RETURN(1);
+  result= 1;
+  goto end;
 }
 
 

sql/sql_view.h

@@ -19,7 +19,7 @@
 bool mysql_create_view(THD *thd,
                        enum_view_create_mode mode);
 
-my_bool mysql_make_view(File_parser *parser, TABLE_LIST *table);
+bool mysql_make_view(THD *thd, File_parser *parser, TABLE_LIST *table);
 
 bool mysql_drop_view(THD *thd, TABLE_LIST *view, enum_drop_mode drop_mode);
 

sql/table.cc

@@ -2654,7 +2654,7 @@ Natural_join_column::check_grants(THD *thd, const char *name, uint length)
   GRANT_INFO *grant;
   const char *db_name;
   const char *table_name;
-  Security_context *save_security_ctx= 0;
+  Security_context *save_security_ctx;
   Security_context *new_sctx= table_ref->security_ctx;
   bool res;
 
@@ -2673,13 +2673,10 @@ Natural_join_column::check_grants(THD *thd, const char *name, uint length)
     table_name= table_ref->table->s->table_name;
   }
 
-  if (new_sctx)
-  {
   save_security_ctx= thd->security_ctx;
+  if (new_sctx)
     thd->security_ctx= new_sctx;
-  }
   res= check_grant_column(thd, grant, db_name, table_name, name, length);
-  if (save_security_ctx)
   thd->security_ctx= save_security_ctx;
   return res;
 }