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mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00

Fixed UNION fields type/length detecting

This commit is contained in:
bell@sanja.is.com.ua
2003-11-23 02:01:15 +02:00
parent 4883d21b29
commit 7191ea0ae3
17 changed files with 799 additions and 317 deletions

View File

@ -25,11 +25,11 @@
#include "sql_select.h"
int mysql_union(THD *thd, LEX *lex, select_result *result,
SELECT_LEX_UNIT *unit, bool tables_and_fields_initied)
SELECT_LEX_UNIT *unit)
{
DBUG_ENTER("mysql_union");
int res= 0;
if (!(res= unit->prepare(thd, result, tables_and_fields_initied)))
if (!(res= unit->prepare(thd, result)))
res= unit->exec();
res|= unit->cleanup();
DBUG_RETURN(res);
@ -59,12 +59,6 @@ select_union::~select_union()
int select_union::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
unit= u;
if (not_describe && list.elements != table->fields)
{
my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT),MYF(0));
return -1;
}
return 0;
}
@ -112,11 +106,11 @@ bool select_union::flush()
}
int st_select_lex_unit::prepare(THD *thd, select_result *sel_result,
bool tables_and_fields_initied)
int st_select_lex_unit::prepare(THD *thd, select_result *sel_result)
{
SELECT_LEX *lex_select_save= thd->lex.current_select;
SELECT_LEX *select_cursor,*sl;
SELECT_LEX *sl, *first_select;
select_result *tmp_result;
DBUG_ENTER("st_select_lex_unit::prepare");
/*
@ -129,74 +123,33 @@ int st_select_lex_unit::prepare(THD *thd, select_result *sel_result,
DBUG_RETURN(0);
prepared= 1;
res= 0;
found_rows_for_union= first_select_in_union()->options & OPTION_FOUND_ROWS;
TMP_TABLE_PARAM tmp_table_param;
t_and_f= tables_and_fields_initied;
bzero((char *)&tmp_table_param,sizeof(TMP_TABLE_PARAM));
thd->lex.current_select= sl= select_cursor= first_select_in_union();
thd->lex.current_select= sl= first_select= first_select_in_union();
found_rows_for_union= first_select->options & OPTION_FOUND_ROWS;
/* Global option */
if (t_and_f)
if (first_select->next_select())
{
// Item list and tables will be initialized by mysql_derived
item_list= select_cursor->item_list;
if (!(tmp_result= union_result= new select_union(0)))
goto err;
union_result->not_describe= 1;
union_result->tmp_table_param= tmp_table_param;
}
else
{
item_list.empty();
TABLE_LIST *first_table= (TABLE_LIST*) select_cursor->table_list.first;
if (setup_tables(first_table) ||
setup_wild(thd, first_table, select_cursor->item_list, 0,
select_cursor->with_wild))
goto err;
List_iterator<Item> it(select_cursor->item_list);
Item *item;
item_list= select_cursor->item_list;
select_cursor->with_wild= 0;
if (select_cursor->setup_ref_array(thd,
select_cursor->order_list.elements +
select_cursor->group_list.elements) ||
setup_fields(thd, select_cursor->ref_pointer_array, first_table,
item_list, 0, 0, 1))
goto err;
// Item list should be fix_fielded yet another time in JOIN::prepare
unfix_item_list(item_list);
t_and_f= 1;
while((item=it++))
{
item->maybe_null=1;
if (item->type() == Item::FIELD_ITEM)
((class Item_field *)item)->field->table->maybe_null=1;
}
tmp_result= sel_result;
// single select should be processed like select in p[arantses
first_select->braces= 1;
}
tmp_table_param.field_count=item_list.elements;
if (!(table= create_tmp_table(thd, &tmp_table_param, item_list,
(ORDER*) 0, !union_option,
1, (select_cursor->options | thd->options |
TMP_TABLE_ALL_COLUMNS),
HA_POS_ERROR, (char*) "")))
goto err;
table->file->extra(HA_EXTRA_WRITE_CACHE);
table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
bzero((char*) &result_table_list,sizeof(result_table_list));
result_table_list.db= (char*) "";
result_table_list.real_name=result_table_list.alias= (char*) "union";
result_table_list.table=table;
if (!(union_result=new select_union(table)))
goto err;
union_result->not_describe=1;
union_result->tmp_table_param=tmp_table_param;
for (;sl; sl= sl->next_select())
{
JOIN *join= new JOIN(thd, sl->item_list,
sl->options | thd->options | SELECT_NO_UNLOCK,
union_result);
tmp_result);
thd->lex.current_select= sl;
offset_limit_cnt= sl->offset_limit;
select_limit_cnt= sl->select_limit+sl->offset_limit;
@ -215,27 +168,76 @@ int st_select_lex_unit::prepare(THD *thd, select_result *sel_result,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) NULL,
sl, this, t_and_f);
t_and_f= 0;
sl, this);
if (res || thd->is_fatal_error)
goto err;
}
item_list.empty();
thd->lex.current_select= lex_select_save;
{
List_iterator<Item> it(select_cursor->item_list);
Field **field;
for (field= table->field; *field; field++)
if (sl == first_select)
{
(void) it++;
if (item_list.push_back(new Item_field(*field)))
DBUG_RETURN(-1);
types.empty();
List_iterator_fast<Item> it(sl->item_list);
Item *item;
while((item= it++))
{
types.push_back(new Item_type_holder(thd, item));
}
if (thd->is_fatal_error)
goto err; // out of memory
}
else
{
if (types.elements != sl->item_list.elements)
{
my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT),MYF(0));
goto err;
}
List_iterator_fast<Item> it(sl->item_list);
List_iterator_fast<Item> tp(types);
Item *type, *item;
while((type= tp++, item= it++))
{
((Item_type_holder*)type)->join_types(thd, item);
}
}
}
if (first_select->next_select())
{
tmp_table_param.field_count= types.elements;
if (!(table= create_tmp_table(thd, &tmp_table_param, types,
(ORDER*) 0, !union_option, 1,
(first_select_in_union()->options |
thd->options |
TMP_TABLE_ALL_COLUMNS),
HA_POS_ERROR, (char*) "")))
goto err;
table->file->extra(HA_EXTRA_WRITE_CACHE);
table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
bzero((char*) &result_table_list, sizeof(result_table_list));
result_table_list.db= (char*) "";
result_table_list.real_name= result_table_list.alias= (char*) "union";
result_table_list.table= table;
union_result->set_table(table);
item_list.empty();
thd->lex.current_select= lex_select_save;
{
Field **field;
for (field= table->field; *field; field++)
{
if (item_list.push_back(new Item_field(*field)))
DBUG_RETURN(-1);
}
}
}
else
first_select->braces= 0; // remove our changes
thd->lex.current_select= lex_select_save;
DBUG_RETURN(res || thd->is_fatal_error ? 1 : 0);
err:
thd->lex.current_select= lex_select_save;
DBUG_RETURN(-1);
@ -419,7 +421,7 @@ int st_select_lex_unit::exec()
(ORDER*)global_parameters->order_list.first,
(ORDER*) NULL, NULL, (ORDER*) NULL,
options | SELECT_NO_UNLOCK,
result, this, fake_select_lex, 0);
result, this, fake_select_lex);
if (!res)
thd->limit_found_rows = (ulonglong)table->file->records + add_rows;
/*