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Fix UNION

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New faster list iterators
Change list code to be simpler and faster
Optimize count(distinct)
New error messages for UNION
Make create_tmp_table more general to be usable by UNION
This commit is contained in:
monty@tik.mysql.fi
2001-08-02 06:29:50 +03:00
parent 423f2851c5
commit b13d453d50
57 changed files with 798 additions and 472 deletions
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14
sql/sql_class.cc
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@ -274,7 +274,7 @@ bool select_send::send_fields(List<Item> &list,uint flag)
bool select_send::send_data(List<Item> &items)
{
List_iterator<Item> li(items);
List_iterator_fast<Item> li(items);
String *packet= &thd->packet;
DBUG_ENTER("send_data");
@ -299,12 +299,6 @@ bool select_send::send_data(List<Item> &items)
DBUG_RETURN(error);
}
void select_send::send_error(uint errcode,const char *err)
{
::send_error(&thd->net,errcode,err);
}
bool select_send::send_eof()
{
/* Unlock tables before sending packet to gain some speed */
@ -367,7 +361,7 @@ select_export::prepare(List<Item> &list)
}
/* Check if there is any blobs in data */
{
List_iterator<Item> li(list);
List_iterator_fast<Item> li(list);
Item *item;
while ((item=li++))
{
@ -414,7 +408,7 @@ bool select_export::send_data(List<Item> &items)
Item *item;
char *buff_ptr=buff;
uint used_length=0,items_left=items.elements;
List_iterator<Item> li(items);
List_iterator_fast<Item> li(items);
if (my_b_write(&cache,(byte*) exchange->line_start->ptr(),
exchange->line_start->length()))
@ -607,7 +601,7 @@ select_dump::prepare(List<Item> &list __attribute__((unused)))
bool select_dump::send_data(List<Item> &items)
{
List_iterator<Item> li(items);
List_iterator_fast<Item> li(items);
char buff[MAX_FIELD_WIDTH];
String tmp(buff,sizeof(buff)),*res;
tmp.length(0);