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This is first cset for WL#1394 "Optimize index merge when all involved index ranges include only values with equal keys"

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The main idea is to exploit the fact that key scans for "key=const" return ordered sequences of rowids.
This commit is contained in:
sergefp@mysql.com
2004-05-13 01:38:40 +04:00
parent b2efad935b
commit a46d7542c9
28 changed files with 3720 additions and 500 deletions
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41
sql/sql_update.cc
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@ -176,18 +176,11 @@ int mysql_update(THD *thd,
}
init_ftfuncs(thd, &thd->lex->select_lex, 1);
/* Check if we are modifying a key that we are used to search with */
if (select && select->quick)
{
if (select->quick->get_type() != QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
{
used_index= select->quick->index;
used_key_is_modified= (!select->quick->unique_key_range() &&
check_if_key_used(table,used_index,fields));
}
else
{
used_key_is_modified= true;
}
used_key_is_modified= (!select->quick->unique_key_range() &&
select->quick->check_if_keys_used(&fields));
}
else if ((used_index=table->file->key_used_on_scan) < MAX_KEY)
used_key_is_modified=check_if_key_used(table, used_index, fields);
@ -246,7 +239,9 @@ int mysql_update(THD *thd,
if (open_cached_file(&tempfile, mysql_tmpdir,TEMP_PREFIX,
DISK_BUFFER_SIZE, MYF(MY_WME)))
goto err;
if (select && select->quick && select->quick->reset())
goto err;
init_read_record(&info,thd,table,select,0,1);
thd->proc_info="Searching rows for update";
uint tmp_limit= limit;
@ -300,6 +295,9 @@ int mysql_update(THD *thd,
if (handle_duplicates == DUP_IGNORE)
table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
if (select && select->quick && select->quick->reset())
goto err;
init_read_record(&info,thd,table,select,0,1);
updated= found= 0;
@ -732,26 +730,7 @@ static bool safe_update_on_fly(JOIN_TAB *join_tab, List<Item> *fields)
case JT_ALL:
/* If range search on index */
if (join_tab->quick)
{
if (join_tab->quick->get_type() != QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
{
return !check_if_key_used(table,join_tab->quick->index,*fields);
}
else
{
QUICK_INDEX_MERGE_SELECT *qsel_imerge=
(QUICK_INDEX_MERGE_SELECT*)(join_tab->quick);
List_iterator_fast<QUICK_RANGE_SELECT> it(qsel_imerge->quick_selects);
QUICK_RANGE_SELECT *quick;
while ((quick= it++))
{
if (check_if_key_used(table, quick->index, *fields))
return 0;
}
return 1;
}
}
return !join_tab->quick->check_if_keys_used(fields);
/* If scanning in clustered key */
if ((table->file->table_flags() & HA_PRIMARY_KEY_IN_READ_INDEX) &&
table->primary_key < MAX_KEY)