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Downported InnoDB support of Index Condition Pushdown from MySQL-5.6 code line.

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This commit is contained in:
Igor Babaev 2011-05-25 16:01:56 -07:00
commit deb3b9a174
25 changed files with 1165 additions and 587 deletions
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65
sql/opt_index_cond_pushdown.cc
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@ -83,15 +83,44 @@ bool uses_index_fields_only(Item *item, TABLE *tbl, uint keyno,
case Item::FIELD_ITEM:
{
Item_field *item_field= (Item_field*)item;
if (item_field->field->table != tbl)
Field *field= item_field->field;
if (field->table != tbl)
return TRUE;
/*
The below is probably a repetition - the first part checks the
other two, but let's play it safe:
*/
return item_field->field->part_of_key.is_set(keyno) &&
item_field->field->type() != MYSQL_TYPE_GEOMETRY &&
item_field->field->type() != MYSQL_TYPE_BLOB;
if(!field->part_of_key.is_set(keyno) ||
field->type() == MYSQL_TYPE_GEOMETRY ||
field->type() == MYSQL_TYPE_BLOB)
return FALSE;
KEY *key_info= tbl->key_info + keyno;
KEY_PART_INFO *key_part= key_info->key_part;
KEY_PART_INFO *key_part_end= key_part + key_info->key_parts;
for ( ; key_part < key_part_end; key_part++)
{
if (field->eq(key_part->field))
return !(key_part->key_part_flag & HA_PART_KEY_SEG);
}
if ((tbl->file->ha_table_flags() & HA_PRIMARY_KEY_IN_READ_INDEX) &&
tbl->s->primary_key != MAX_KEY &&
tbl->s->primary_key != keyno)
{
key_info= tbl->key_info + tbl->s->primary_key;
key_part= key_info->key_part;
key_part_end= key_part + key_info->key_parts;
for ( ; key_part < key_part_end; key_part++)
{
/*
It does not make sense to use the fact that the engine can read in
a full field if the key if the index is built only over a part
of this field.
*/
if (field->eq(key_part->field))
return !(key_part->key_part_flag & HA_PART_KEY_SEG);
}
}
return FALSE;
}
case Item::REF_ITEM:
return uses_index_fields_only(item->real_item(), tbl, keyno,
@ -288,30 +317,12 @@ void push_index_cond(JOIN_TAB *tab, uint keyno)
{
DBUG_ENTER("push_index_cond");
Item *idx_cond;
bool do_index_cond_pushdown=
((tab->table->file->index_flags(keyno, 0, 1) &
if ((tab->table->file->index_flags(keyno, 0, 1) &
HA_DO_INDEX_COND_PUSHDOWN) &&
optimizer_flag(tab->join->thd, OPTIMIZER_SWITCH_INDEX_COND_PUSHDOWN));
/*
Do not try index condition pushdown on indexes which have partially-covered
columns. Unpacking from a column prefix into index tuple is not a supported
operation in some engines, see e.g. MySQL BUG#42991.
TODO: a better solution would be not to consider partially-covered columns
as parts of the index and still produce/check index condition for
fully-covered index columns.
*/
KEY *key_info= tab->table->key_info + keyno;
for (uint kp= 0; kp < key_info->key_parts; kp++)
{
if ((key_info->key_part[kp].key_part_flag & HA_PART_KEY_SEG))
{
do_index_cond_pushdown= FALSE;
break;
}
}
if (do_index_cond_pushdown)
optimizer_flag(tab->join->thd, OPTIMIZER_SWITCH_INDEX_COND_PUSHDOWN) &&
tab->join->thd->lex->sql_command != SQLCOM_UPDATE_MULTI &&
tab->join->thd->lex->sql_command != SQLCOM_DELETE_MULTI)
{
DBUG_EXECUTE("where",
print_where(tab->select_cond, "full cond", QT_ORDINARY););