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Some code optimisations related to EXPLAIN of derived tables and the

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resulting code cleanup in our main loop.
This commit is contained in:
Sinisa@sinisa.nasamreza.org
2002-11-09 15:40:46 +02:00
parent bd6f8e0b5f
commit d96c670c70
6 changed files with 37 additions and 90 deletions
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10
sql/sql_derived.cc
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@ -28,8 +28,7 @@
static const char *any_db="*any*"; // Special symbol for check_access
int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
bool tables_is_opened)
int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
{
/*
TODO: make derived tables with union inside (now only 1 SELECT may be
@ -58,7 +57,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
if (cursor->derived)
{
res= mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived,
cursor, 0);
cursor);
if (res) DBUG_RETURN(res);
}
}
@ -68,7 +67,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
while ((item= it++))
item_list.push_back(item);
if (tables_is_opened || !(res=open_and_lock_tables(thd,tables)))
if (!(res=open_and_lock_tables(thd,tables)))
{
if (setup_fields(thd,tables,item_list,0,0,1))
{
@ -112,7 +111,8 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
t->real_name=table->real_name;
t->table=table;
table->derived_select_number= sl->select_number;
sl->exclude();
if (!lex->describe)
sl->exclude();
t->db= (tables && tables->db && tables->db[0]) ? t->db : thd->db;
t->derived=(SELECT_LEX *)0; // just in case ...
}