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new EXPLAIN

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fixed bug in mysql-test/create-test-result
fixed bug in union-subselect engine
This commit is contained in:
bell@sanja.is.com.ua
2002-09-26 23:08:22 +03:00
parent d9989c635e
commit 46a22a5be7
36 changed files with 607 additions and 457 deletions
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108
sql/sql_parse.cc
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@ -1254,7 +1254,7 @@ mysql_execute_command(void)
THD *thd= current_thd;
LEX *lex= &thd->lex;
TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
SELECT_LEX *select_lex= lex->select;
SELECT_LEX *select_lex= &lex->select_lex;
SELECT_LEX_UNIT *unit= &lex->unit;
DBUG_ENTER("mysql_execute_command");
@ -1281,18 +1281,69 @@ mysql_execute_command(void)
#endif
}
select_result *explain_result= 0;
/*
Skip if we are in the slave thread, some table rules have been given
and the table list says the query should not be replicated
TODO: make derived tables processing 'inside' SELECT processing.
TODO: solve problem with depended derived tables in subselects
*/
if (lex->derived_tables)
if (lex->sql_command == SQLCOM_SELECT &&
(select_lex->options & SELECT_DESCRIBE) &&
lex->derived_tables)
{
if (!(explain_result= new select_send()))
{
send_error(&thd->net, ER_OUT_OF_RESOURCES);
DBUG_VOID_RETURN;
}
//check rights
for (TABLE_LIST *cursor= tables;
cursor;
cursor= cursor->next)
if (cursor->derived)
{
TABLE_LIST *tables=
(TABLE_LIST *)((SELECT_LEX_UNIT *)
cursor->derived)->first_select()->table_list.first;
int res;
if (tables)
res= check_table_access(thd,SELECT_ACL, tables);
else
res= check_access(thd, SELECT_ACL, any_db);
if (res)
DBUG_VOID_RETURN;
}
thd->send_explain_fields(explain_result);
// EXPLAIN derived tables
for (TABLE_LIST *cursor= tables;
cursor;
cursor= cursor->next)
if (cursor->derived)
{
SELECT_LEX *select_lex= ((SELECT_LEX_UNIT *)
cursor->derived)->first_select();
if (!open_and_lock_tables(thd,
(TABLE_LIST*) select_lex->table_list.first))
{
mysql_explain_select(thd, select_lex,
"DERIVED", explain_result);
// execute derived table SELECT to provide table for other SELECTs
if (mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived,
cursor, 1))
DBUG_VOID_RETURN;
}
else
DBUG_VOID_RETURN;
}
}
else if (lex->derived_tables)
{
for (TABLE_LIST *cursor= tables;
cursor;
cursor= cursor->next)
if (cursor->derived && mysql_derived(thd, lex,
(SELECT_LEX_UNIT *)cursor->derived,
cursor))
cursor, 0))
DBUG_VOID_RETURN;
}
if ((lex->select_lex.next_select_in_list() &&
@ -1374,8 +1425,44 @@ mysql_execute_command(void)
if (!(res=open_and_lock_tables(thd,tables)))
{
query_cache_store_query(thd, tables);
res=handle_select(thd, lex, result);
if (select_lex->options & SELECT_DESCRIBE)
{
delete result; // we do not need it for explain
if (!explain_result)
if (!(explain_result= new select_send()))
{
send_error(&thd->net, ER_OUT_OF_RESOURCES);
DBUG_VOID_RETURN;
}
else
thd->send_explain_fields(explain_result);
fix_tables_pointers(select_lex);
for ( SELECT_LEX *sl= select_lex;
sl && res == 0;
sl= sl->next_select_in_list())
{
SELECT_LEX *first= sl->master_unit()->first_select();
res= mysql_explain_select(thd, sl,
((select_lex==sl)?"FIRST":
((sl == first)?
((sl->depended)?"DEPENDENT SUBSELECT":
"SUBSELECT"):
((sl->depended)?"DEPENDENT UNION":
"UNION"))),
explain_result);
}
if (res > 0)
res= -res; // mysql_explain_select do not report error
MYSQL_LOCK *save_lock= thd->lock;
thd->lock= (MYSQL_LOCK *)0;
explain_result->send_eof();
thd->lock= save_lock;
}
else
{
query_cache_store_query(thd, tables);
res=handle_select(thd, lex, result);
}
}
else
delete result;
@ -1866,7 +1953,7 @@ mysql_execute_command(void)
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE,
result, unit, 0);
result, unit, select_lex, 0);
delete result;
}
else
@ -2037,7 +2124,7 @@ mysql_execute_command(void)
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE,
result, unit, 0);
result, unit, select_lex, 0);
delete result;
}
else
@ -2803,6 +2890,7 @@ mysql_init_query(THD *thd)
thd->lex.unit.global_parameters= &thd->lex.select_lex; //Global limit & order
thd->lex.select_lex.master= &thd->lex.unit;
thd->lex.select_lex.prev= &thd->lex.unit.slave;
thd->select_number= thd->lex.select_lex.select_number= 1;
thd->lex.value_list.empty();
thd->free_list= 0;
thd->lex.union_option= 0;
@ -2832,6 +2920,7 @@ bool
mysql_new_select(LEX *lex, bool move_down)
{
SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
select_lex->select_number= ++lex->thd->select_number;
if (!select_lex)
return 1;
select_lex->init_query();
@ -2874,6 +2963,7 @@ mysql_parse(THD *thd, char *inBuf, uint length)
mysql_init_query(thd);
thd->query_length = length;
thd->lex.derived_tables= false;
if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
{
LEX *lex=lex_start(thd, (uchar*) inBuf, length);