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MWL#90: Address review feedback part #10.

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This commit is contained in:
Sergey Petrunya 2011-03-25 14:24:58 +03:00
parent 253087815a
commit 5a07fcc6c4
1 changed files with 19 additions and 19 deletions
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38
sql/sql_select.cc
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@ -8492,14 +8492,12 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
if (!join->select_lex->sj_nests.is_empty() &&
setup_semijoin_dups_elimination(join, options, no_jbuf_after))
DBUG_RETURN(TRUE); /* purecov: inspected */
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
/* For const tables, set partial_join_cardinality to 1. */
for (tab= join->join_tab; tab != join->join_tab + join->const_tables; tab++)
tab->partial_join_cardinality= 1;
}
JOIN_TAB *prev_tab= NULL;
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES), i= join->const_tables;
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
@ -8510,11 +8508,11 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
- it does not differentiate between inner joins, outer joins and semi-joins.
Later it should be improved.
*/
JOIN_TAB *prev_tab= tab - 1;
if ((tab->bush_root_tab && tab->bush_root_tab->bush_children->start == tab) ||
(tab == join->join_tab + join->const_tables))
if (tab->bush_root_tab && tab->bush_root_tab->bush_children->start == tab)
prev_tab= NULL;
DBUG_ASSERT(tab->bush_children || tab->table == join->best_positions[i].table->table);
tab->partial_join_cardinality= join->best_positions[i].records_read *
(prev_tab? prev_tab->partial_join_cardinality : 1);
if (!tab->bush_children)
@ -8522,10 +8520,11 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
}
check_join_cache_usage_for_tables(join, options, no_jbuf_after);
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES), i= join->const_tables;
JOIN_TAB *first_tab;
for (tab= first_tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS), i++)
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
if (tab->bush_children)
{
@ -8632,7 +8631,7 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
{
if (!tab->bush_children)
tab->read_first_record= join_init_read_record;
if (i == join->const_tables)
if (tab == first_tab)
{
if (tab->select && tab->select->quick)
{
@ -8709,16 +8708,16 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
}
uint n_top_tables= join->join_tab_ranges.head()->end -
join->join_tab_ranges.head()->start;
join->join_tab[n_top_tables - 1].next_select=0; /* Set by do_select */
join->join_tab[n_top_tables - 1].next_select=0; /* Set by do_select */
/*
If a join buffer is used to join a table the ordering by an index
for the first non-constant table cannot be employed anymore.
*/
//for (i=join->const_tables ; i < join->tables ; i++)
for (i=join->const_tables ; i < n_top_tables ; i++)
for (tab= join->join_tab + join->const_tables ;
tab != join->join_tab + n_top_tables ; tab++)
{
JOIN_TAB *tab=join->join_tab+i;
if (tab->use_join_cache)
{
JOIN_TAB *sort_by_tab= join->group && join->simple_group &&
@ -10350,8 +10349,9 @@ Item *eliminate_item_equal(COND *cond, COND_EQUAL *upper_levels,
/*
Pick the "head" item: the constant one or the first in the join order
that's not inside some SJM nest. psergey2: out-of-date comment. It is ok
inside SJM, too.
(if the first in the join order happends to be inside an SJM nest, that's
ok, because this is where the value will be unpacked after
materialization).
*/
if (item_const)
head= item_const;