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make JOIN::prepare, JOIN::optimize only once for EXPLAIN of derived table

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(BUG#2120 sfter merge)
This commit is contained in:
bell@sanja.is.com.ua
2004-02-01 20:07:44 +02:00
parent bd259f54c9
commit f9af8578bc
6 changed files with 47 additions and 16 deletions
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18
sql/sql_select.cc
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@ -1579,8 +1579,8 @@ mysql_select(THD *thd, Item ***rref_pointer_array,
goto err;
}
}
free_join= 0;
}
free_join= 0;
join->select_options= select_options;
}
else
@ -3769,11 +3769,6 @@ JOIN::join_free(bool full)
{
if (tab->table)
{
if (tab->table->key_read)
{
tab->table->key_read= 0;
tab->table->file->extra(HA_EXTRA_NO_KEYREAD);
}
/* Don't free index if we are using read_record */
if (!tab->read_record.table)
tab->table->file->index_end();
@ -9128,6 +9123,9 @@ int mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
sl;
sl= sl->next_select())
{
// drop UNCACHEABLE_EXPLAIN, because it is for internal usage only
uint8 uncacheable= (sl->uncacheable & ~UNCACHEABLE_EXPLAIN);
res= mysql_explain_select(thd, sl,
(((&thd->lex->select_lex)==sl)?
((thd->lex->all_selects_list != sl) ?
@ -9135,13 +9133,13 @@ int mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
((sl == first)?
((sl->linkage == DERIVED_TABLE_TYPE) ?
"DERIVED":
((sl->uncacheable & UNCACHEABLE_DEPENDENT) ?
((uncacheable & UNCACHEABLE_DEPENDENT) ?
"DEPENDENT SUBQUERY":
(sl->uncacheable?"UNCACHEABLE SUBQUERY":
(uncacheable?"UNCACHEABLE SUBQUERY":
"SUBQUERY"))):
((sl->uncacheable & UNCACHEABLE_DEPENDENT) ?
((uncacheable & UNCACHEABLE_DEPENDENT) ?
"DEPENDENT UNION":
sl->uncacheable?"UNCACHEABLE UNION":
uncacheable?"UNCACHEABLE UNION":
"UNION"))),
result);
if (res)