Further work on UNION's

parent 02278726
This diff is collapsed.
...@@ -1754,10 +1754,8 @@ mysql_execute_command(void) ...@@ -1754,10 +1754,8 @@ mysql_execute_command(void)
break; break;
} }
if (!(res=open_and_lock_tables(thd,(TABLE_LIST *)total->first))) if (!(res=open_and_lock_tables(thd,(TABLE_LIST *)total->first)))
{
res=mysql_union(thd,lex, select_lex->select_number+1); res=mysql_union(thd,lex, select_lex->select_number+1);
if (res==-1) res=0; close_thread_tables(thd);
}
break; break;
} }
case SQLCOM_DROP_TABLE: case SQLCOM_DROP_TABLE:
......
/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* UNION of select's */
/* UNION's were introduced by Monty and Sinisa <sinisa@mysql.com> */
#include "mysql_priv.h" #include "mysql_priv.h"
...@@ -6,8 +28,8 @@ ...@@ -6,8 +28,8 @@
int mysql_union(THD *thd,LEX *lex,uint no_of_selects) int mysql_union(THD *thd,LEX *lex,uint no_of_selects)
{ {
SELECT_LEX *sl, *for_order=&lex->select_lex; uint no=0; int res; SELECT_LEX *sl, *for_order=&lex->select_lex; uint no=0; int res=0;
List<Item> fields; TABLE *table; List<Item> fields; TABLE *table=(TABLE *)NULL; TABLE_LIST *resulting=(TABLE_LIST *)NULL;
for (;for_order->next;for_order=for_order->next); for (;for_order->next;for_order=for_order->next);
ORDER *some_order = (ORDER *)for_order->order_list.first; ORDER *some_order = (ORDER *)for_order->order_list.first;
for (sl=&lex->select_lex;sl;sl=sl->next, no++) for (sl=&lex->select_lex;sl;sl=sl->next, no++)
...@@ -38,16 +60,19 @@ int mysql_union(THD *thd,LEX *lex,uint no_of_selects) ...@@ -38,16 +60,19 @@ int mysql_union(THD *thd,LEX *lex,uint no_of_selects)
delete result; delete result;
return res; return res;
} }
else table=result->table;
{ List_iterator<Item> it(*(result->fields));
table=result->table; Item *item;
List_iterator<Item> it(*(result->fields)); while ((item= it++))
Item *item; fields.push_back(item);
while ((item= it++))
fields.push_back(item);
}
delete result; delete result;
if (reopen_table(table)) return 1; if (!reopen_table(table)) return 1;
if (!(resulting = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
return 1;
resulting->db=tables->db ? tables->db : thd->db;
resulting->real_name=table->real_name;
resulting->name=table->table_name;
resulting->table=table;
} }
else else
return -1; return -1;
...@@ -73,29 +98,41 @@ int mysql_union(THD *thd,LEX *lex,uint no_of_selects) ...@@ -73,29 +98,41 @@ int mysql_union(THD *thd,LEX *lex,uint no_of_selects)
return -1; return -1;
} }
} }
if (1) // Meaning if not SELECT ... INTO .... which will be done later select_result *result;
List<Item> item_list;
List<Item_func_match> ftfunc_list;
ftfunc_list.empty();
if (item_list.push_back(new Item_field(NULL,NULL,"*")))
return -1;
if (lex->exchange)
{ {
READ_RECORD info; if (lex->exchange->dumpfile)
int error=0;
if (send_fields(thd,fields,1)) return 1;
SQL_SELECT *select= new SQL_SELECT;
select->head=table;
select->file=*(table->io_cache);
init_read_record(&info,thd,table,select,1,1);
while (!(error=info.read_record(&info)) && !thd->killed)
{ {
if (!(result=new select_dump(lex->exchange)))
if (error) return -1;
{ }
table->file->print_error(error,MYF(0)); else
break; {
} if (!(result=new select_export(lex->exchange)))
return -1;
} }
end_read_record(&info);
delete select;
} }
else if (!(result=new select_send()))
return -1;
else else
{ {
res=mysql_select(thd,resulting,item_list,
NULL,
ftfunc_list,
(ORDER*) NULL,
(ORDER*) NULL,
NULL,
(ORDER*) NULL,
thd->options,
result);
if (res)
result->abort();
} }
return 0; delete result;
return res;
} }
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