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Fixed UNION fields type/length detecting

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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
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152
sql/sql_derived.cc
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@ -62,16 +62,15 @@
int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
TABLE_LIST *org_table_list)
{
SELECT_LEX *select_cursor= unit->first_select();
List<Item> item_list;
SELECT_LEX *first_select= unit->first_select();
TABLE *table;
int res;
select_union *derived_result;
TABLE_LIST *tables= (TABLE_LIST *)select_cursor->table_list.first;
TABLE_LIST *tables= (TABLE_LIST *)first_select->table_list.first;
TMP_TABLE_PARAM tmp_table_param;
bool is_union= select_cursor->next_select() &&
select_cursor->next_select()->linkage == UNION_TYPE;
bool is_subsel= select_cursor->first_inner_unit() ? 1: 0;
bool is_union= first_select->next_select() &&
first_select->next_select()->linkage == UNION_TYPE;
bool is_subsel= first_select->first_inner_unit() ? 1: 0;
SELECT_LEX *save_current_select= lex->current_select;
DBUG_ENTER("mysql_derived");
@ -112,16 +111,12 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
fix_tables_pointers(unit);
}
lex->current_select= select_cursor;
TABLE_LIST *first_table= (TABLE_LIST*) select_cursor->table_list.first;
/* Setting up. A must if a join or IGNORE, USE or similar are utilised */
if (setup_tables(first_table) ||
setup_wild(thd, first_table, select_cursor->item_list, 0,
select_cursor->with_wild))
{
res= -1;
if(!(derived_result= new select_union(0)))
DBUG_RETURN(1); // out of memory
// st_select_lex_unit::prepare coppectly work for single select
if ((res= unit->prepare(thd, derived_result)))
goto exit;
}
/*
This is done in order to redo all field optimisations when any of the
@ -133,30 +128,16 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
cursor->table->clear_query_id= 1;
}
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))
{
res= -1;
goto exit;
}
// Item list should be fix_fielded yet another time in JOIN::prepare
unfix_item_list(item_list);
bzero((char*) &tmp_table_param,sizeof(tmp_table_param));
tmp_table_param.field_count= item_list.elements;
tmp_table_param.field_count= unit->types.elements;
/*
Temp table is created so that it hounours if UNION without ALL is to be
processed
*/
if (!(table= create_tmp_table(thd, &tmp_table_param, item_list,
if (!(table= create_tmp_table(thd, &tmp_table_param, unit->types,
(ORDER*) 0,
is_union && !unit->union_option, 1,
(select_cursor->options | thd->options |
(first_select->options | thd->options |
TMP_TABLE_ALL_COLUMNS),
HA_POS_ERROR,
org_table_list->alias)))
@ -164,70 +145,69 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
res= -1;
goto exit;
}
if ((derived_result=new select_union(table)))
derived_result->set_table(table);
derived_result->tmp_table_param=tmp_table_param;
unit->offset_limit_cnt= first_select->offset_limit;
unit->select_limit_cnt= first_select->select_limit+
first_select->offset_limit;
if (unit->select_limit_cnt < first_select->select_limit)
unit->select_limit_cnt= HA_POS_ERROR;
if (unit->select_limit_cnt == HA_POS_ERROR)
first_select->options&= ~OPTION_FOUND_ROWS;
if (is_union)
res= mysql_union(thd, lex, derived_result, unit);
else
res= mysql_select(thd, &first_select->ref_pointer_array,
(TABLE_LIST*) first_select->table_list.first,
first_select->with_wild,
first_select->item_list, first_select->where,
(first_select->order_list.elements+
first_select->group_list.elements),
(ORDER *) first_select->order_list.first,
(ORDER *) first_select->group_list.first,
first_select->having, (ORDER*) NULL,
(first_select->options | thd->options |
SELECT_NO_UNLOCK),
derived_result, unit, first_select);
if (!res)
{
derived_result->tmp_table_param=tmp_table_param;
unit->offset_limit_cnt= select_cursor->offset_limit;
unit->select_limit_cnt= select_cursor->select_limit+
select_cursor->offset_limit;
if (unit->select_limit_cnt < select_cursor->select_limit)
unit->select_limit_cnt= HA_POS_ERROR;
if (unit->select_limit_cnt == HA_POS_ERROR)
select_cursor->options&= ~OPTION_FOUND_ROWS;
if (is_union)
res= mysql_union(thd, lex, derived_result, unit, 1);
/*
Here we entirely fix both TABLE_LIST and list of SELECT's as
there were no derived tables
*/
if (derived_result->flush())
res= 1;
else
res= mysql_select(thd, &select_cursor->ref_pointer_array,
(TABLE_LIST*) select_cursor->table_list.first,
select_cursor->with_wild,
select_cursor->item_list, select_cursor->where,
(select_cursor->order_list.elements+
select_cursor->group_list.elements),
(ORDER *) select_cursor->order_list.first,
(ORDER *) select_cursor->group_list.first,
select_cursor->having, (ORDER*) NULL,
(select_cursor->options | thd->options |
SELECT_NO_UNLOCK),
derived_result, unit, select_cursor, 1);
if (!res)
{
/*
Here we entirely fix both TABLE_LIST and list of SELECT's as
there were no derived tables
*/
if (derived_result->flush())
res= 1;
else
{
org_table_list->real_name=table->real_name;
org_table_list->table=table;
table->derived_select_number= select_cursor->select_number;
table->tmp_table= TMP_TABLE;
org_table_list->real_name=table->real_name;
org_table_list->table=table;
table->derived_select_number= first_select->select_number;
table->tmp_table= TMP_TABLE;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
org_table_list->grant.privilege= SELECT_ACL;
org_table_list->grant.privilege= SELECT_ACL;
#endif
if (lex->describe)
if (lex->describe)
{
// to fix a problem in EXPLAIN
if (tables)
{
// to fix a problem in EXPLAIN
if (tables)
{
for (TABLE_LIST *cursor= tables; cursor; cursor= cursor->next)
if (cursor->table_list)
cursor->table_list->table=cursor->table;
}
for (TABLE_LIST *cursor= tables; cursor; cursor= cursor->next)
if (cursor->table_list)
cursor->table_list->table=cursor->table;
}
else
unit->exclude_tree();
org_table_list->db= (char *)"";
// Force read of table stats in the optimizer
table->file->info(HA_STATUS_VARIABLE);
}
else
unit->exclude_tree();
org_table_list->db= (char *)"";
// Force read of table stats in the optimizer
table->file->info(HA_STATUS_VARIABLE);
}
delete derived_result;
}
delete derived_result;
if (res)
free_tmp_table(thd, table);
else