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Manual merge

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This commit is contained in:
sergefp@mysql.com
2004-06-14 11:18:56 +04:00
parent 078f717804 2e93dfaf42
commit ee0a516ccd
30 changed files with 4470 additions and 599 deletions
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126
sql/sql_select.cc
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@ -8061,8 +8061,16 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
}
else if (select && select->quick) // Range found by opt_range
{
/* assume results are not ordered when index merge is used */
if (select->quick->get_type() == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
int quick_type= select->quick->get_type();
/*
assume results are not ordered when index merge is used
TODO: sergeyp: Results of all index merge selects actually are ordered
by clustered PK values.
*/
if (quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE ||
quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION ||
quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT)
DBUG_RETURN(0);
ref_key= select->quick->index;
ref_key_parts= select->quick->used_key_parts;
@ -8123,9 +8131,11 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
*/
if (!select->quick->reverse_sorted())
{
int quick_type= select->quick->get_type();
if (table->file->index_flags(ref_key) & HA_NOT_READ_PREFIX_LAST ||
(select->quick->get_type() ==
QUICK_SELECT_I::QS_TYPE_INDEX_MERGE))
quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE ||
quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT ||
quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION)
DBUG_RETURN(0); // Use filesort
// ORDER BY range_key DESC
@ -10105,6 +10115,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
select_result *result=join->result;
Item *item_null= new Item_null();
CHARSET_INFO *cs= system_charset_info;
int quick_type;
DBUG_ENTER("select_describe");
DBUG_PRINT("info", ("Select 0x%lx, type %s, message %s",
(ulong)join->select_lex, join->select_lex->type,
@ -10196,17 +10207,20 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
{
JOIN_TAB *tab=join->join_tab+i;
TABLE *table=tab->table;
char buff[512],*buff_ptr=buff;
char buff[512];
char buff1[512], buff2[512], buff3[512];
char keylen_str_buf[64];
String extra(buff, sizeof(buff),cs);
char table_name_buffer[NAME_LEN];
String tmp1(buff1,sizeof(buff1),cs);
String tmp2(buff2,sizeof(buff2),cs);
String tmp3(buff3,sizeof(buff3),cs);
extra.length(0);
tmp1.length(0);
tmp2.length(0);
tmp3.length(0);
quick_type= -1;
item_list.empty();
/* id */
item_list.push_back(new Item_uint((uint32)
@ -10217,8 +10231,10 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
cs));
if (tab->type == JT_ALL && tab->select && tab->select->quick)
{
if (tab->select->quick->get_type() ==
QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
quick_type= tab->select->quick->get_type();
if ((quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE) ||
(quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT) ||
(quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION))
tab->type = JT_INDEX_MERGE;
else
tab->type = JT_RANGE;
@ -10241,7 +10257,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
strlen(join_type_str[tab->type]),
cs));
uint j;
/* possible_keys */
/* Build "possible_keys" value and add it to item_list */
if (!tab->keys.is_clear_all())
{
for (j=0 ; j < table->keys ; j++)
@ -10260,7 +10276,8 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
item_list.push_back(new Item_string(tmp1.ptr(),tmp1.length(),cs));
else
item_list.push_back(item_null);
/* key key_len ref */
/* Build "key", "key_len", and "ref" values and add them to item_list */
if (tab->ref.key_parts)
{
KEY *key_info=table->key_info+ tab->ref.key;
@ -10296,48 +10313,9 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
}
else if (tab->select && tab->select->quick)
{
if (tab->select->quick->get_type() ==
QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
{
QUICK_INDEX_MERGE_SELECT *quick_imerge=
(QUICK_INDEX_MERGE_SELECT*)tab->select->quick;
QUICK_RANGE_SELECT *quick;
List_iterator_fast<QUICK_RANGE_SELECT> it(quick_imerge->
quick_selects);
while ((quick= it++))
{
KEY *key_info= table->key_info + quick->index;
register uint length;
if (tmp3.length())
tmp3.append(',');
tmp3.append(key_info->name);
if (tmp2.length())
tmp2.append(',');
length= longlong2str(quick->max_used_key_length, keylen_str_buf,
10) -
keylen_str_buf;
tmp2.append(keylen_str_buf, length);
}
}
else
{
KEY *key_info= table->key_info + tab->select->quick->index;
register uint length;
tmp3.append(key_info->name);
length= longlong2str(tab->select->quick->max_used_key_length,
keylen_str_buf, 10) -
keylen_str_buf;
tmp2.append(keylen_str_buf, length);
}
item_list.push_back(new Item_string(tmp3.ptr(),tmp3.length(),cs));
tab->select->quick->add_keys_and_lengths(&tmp2, &tmp3);
item_list.push_back(new Item_string(tmp2.ptr(),tmp2.length(),cs));
item_list.push_back(new Item_string(tmp3.ptr(),tmp3.length(),cs));
item_list.push_back(item_null);
}
else
@ -10346,52 +10324,68 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
item_list.push_back(item_null);
item_list.push_back(item_null);
}
/* rows */
/* Add "rows" field to item_list. */
item_list.push_back(new Item_int((longlong) (ulonglong)
join->best_positions[i]. records_read,
21));
/* extra */
/* Build "Extra" field and add it to item_list. */
my_bool key_read=table->key_read;
if ((tab->type == JT_NEXT || tab->type == JT_CONST) &&
table->used_keys.is_set(tab->index))
key_read=1;
if (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT &&
!((QUICK_ROR_INTERSECT_SELECT*)tab->select->quick)->need_to_fetch_row)
key_read=1;
if (tab->info)
item_list.push_back(new Item_string(tab->info,strlen(tab->info),cs));
else
{
if (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION ||
quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT ||
quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
{
extra.append("; Using ");
tab->select->quick->add_info_string(&extra);
}
if (tab->select)
{
if (tab->use_quick == 2)
{
char buf[MAX_KEY/8+1];
sprintf(buff_ptr,"; Range checked for each record (index map: 0x%s)",
tab->keys.print(buf));
buff_ptr=strend(buff_ptr);
extra.append("; Range checked for each record (index map: 0x");
extra.append(tab->keys.print(buf));
extra.append(')');
}
else
buff_ptr=strmov(buff_ptr,"; Using where");
extra.append("; Using where");
}
if (key_read)
buff_ptr= strmov(buff_ptr,"; Using index");
extra.append("; Using index");
if (table->reginfo.not_exists_optimize)
buff_ptr= strmov(buff_ptr,"; Not exists");
extra.append("; Not exists");
if (need_tmp_table)
{
need_tmp_table=0;
buff_ptr= strmov(buff_ptr,"; Using temporary");
extra.append("; Using temporary");
}
if (need_order)
{
need_order=0;
buff_ptr= strmov(buff_ptr,"; Using filesort");
extra.append("; Using filesort");
}
if (distinct & test_all_bits(used_tables,thd->used_tables))
buff_ptr= strmov(buff_ptr,"; Distinct");
if (buff_ptr == buff)
buff_ptr+= 2; // Skip inital "; "
item_list.push_back(new Item_string(buff+2,(uint) (buff_ptr - buff)-2,
cs));
extra.append("; Distinct");
/* Skip initial "; "*/
const char *str= extra.ptr();
uint32 len= extra.length();
if (len)
{
str += 2;
len -= 2;
}
item_list.push_back(new Item_string(str, len, cs));
}
// For next iteration
used_tables|=table->map;