database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Fix for bug#5088:

Browse Source 
* When executing EXPLAIN, do the same as for the query: convert join type to JT_CONST if keyuse array covers all key parts and all of them are constants.
 * In remove_const, don't remove conditions that depend on some-const-table and current-table.


mysql-test/r/join_outer.result:
  Testcase for bug#5088
mysql-test/t/join_outer.test:
  Testcase for bug#5088
This commit is contained in:
unknown
2004-08-23 12:31:56 +04:00
parent 83e3d3f9a3
commit 34c8e46dc3
3 changed files with 124 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
sql/sql_select.cc
View File

@ -3215,6 +3215,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
store_key **ref_key= j->ref.key_copy;
byte *key_buff=j->ref.key_buff, *null_ref_key= 0;
bool keyuse_uses_no_tables= true;
if (ftkey)
{
j->ref.items[0]=((Item_func*)(keyuse->val))->key_item();
@ -3234,6 +3235,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
uint maybe_null= test(keyinfo->key_part[i].null_bit);
j->ref.items[i]=keyuse->val; // Save for cond removal
keyuse_uses_no_tables= keyuse_uses_no_tables & !keyuse->used_tables;
if (!keyuse->used_tables &&
!(join->select_options & SELECT_DESCRIBE))
{ // Compare against constant
@ -3273,7 +3275,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
j->type= null_ref_key ? JT_REF_OR_NULL : JT_REF;
j->ref.null_ref_key= null_ref_key;
}
else if (ref_key == j->ref.key_copy)
else if (keyuse_uses_no_tables)
{
/*
This happen if we are using a constant expression in the ON part
@ -4062,7 +4064,7 @@ remove_const(JOIN *join,ORDER *first_order, COND *cond, bool *simple_order)
}
if ((ref=order_tables & (not_const_tables ^ first_table)))
{
if (only_eq_ref_tables(join,first_order,ref))
if (!(order_tables & first_table) && only_eq_ref_tables(join,first_order,ref))
{
DBUG_PRINT("info",("removing: %s", order->item[0]->full_name()));
continue;