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Merge branch '5.5' into 10.0

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This commit is contained in:
Vicențiu Ciorbaru
2017-03-03 01:37:54 +02:00
parent cc413ce9a3 5a0fff50f8
commit 1acfa942ed
154 changed files with 3475 additions and 1793 deletions
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77
sql/sql_select.cc
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@ -8510,8 +8510,6 @@ get_best_combination(JOIN *join)
form=join->table[tablenr]=j->table;
used_tables|= form->map;
form->reginfo.join_tab=j;
if (!*j->on_expr_ref)
form->reginfo.not_exists_optimize=0; // Only with LEFT JOIN
DBUG_PRINT("info",("type: %d", j->type));
if (j->type == JT_CONST)
goto loop_end; // Handled in make_join_stat..
@ -9355,7 +9353,10 @@ make_outerjoin_info(JOIN *join)
tab->cond_equal= tbl->cond_equal;
if (embedding && !embedding->is_active_sjm())
tab->first_upper= embedding->nested_join->first_nested;
}
}
else if (!embedding)
tab->table->reginfo.not_exists_optimize= 0;
for ( ; embedding ; embedding= embedding->embedding)
{
if (embedding->is_active_sjm())
@ -9365,7 +9366,10 @@ make_outerjoin_info(JOIN *join)
}
/* Ignore sj-nests: */
if (!(embedding->on_expr && embedding->outer_join))
{
tab->table->reginfo.not_exists_optimize= 0;
continue;
}
NESTED_JOIN *nested_join= embedding->nested_join;
if (!nested_join->counter)
{
@ -9381,17 +9385,10 @@ make_outerjoin_info(JOIN *join)
}
if (!tab->first_inner)
tab->first_inner= nested_join->first_nested;
if (tab->table->reginfo.not_exists_optimize)
tab->first_inner->table->reginfo.not_exists_optimize= 1;
if (++nested_join->counter < nested_join->n_tables)
break;
/* Table tab is the last inner table for nested join. */
nested_join->first_nested->last_inner= tab;
if (tab->first_inner->table->reginfo.not_exists_optimize)
{
for (JOIN_TAB *join_tab= tab->first_inner; join_tab <= tab; join_tab++)
join_tab->table->reginfo.not_exists_optimize= 1;
}
}
}
DBUG_RETURN(FALSE);
@ -15510,7 +15507,9 @@ static Field *create_tmp_field_from_item(THD *thd, Item *item, TABLE *table,
if (new_field)
new_field->init(table);
if (copy_func && item->real_item()->is_result_field())
if (copy_func &&
(item->is_result_field() ||
(item->real_item()->is_result_field())))
*((*copy_func)++) = item; // Save for copy_funcs
if (modify_item)
item->set_result_field(new_field);
@ -17982,32 +17981,41 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
first_unmatched->found= 1;
for (JOIN_TAB *tab= first_unmatched; tab <= join_tab; tab++)
{
/*
Check whether 'not exists' optimization can be used here.
If tab->table->reginfo.not_exists_optimize is set to true
then WHERE contains a conjunctive predicate IS NULL over
a non-nullable field of tab. When activated this predicate
will filter out all records with matches for the left part
of the outer join whose inner tables start from the
first_unmatched table and include table tab. To safely use
'not exists' optimization we have to check that the
IS NULL predicate is really activated, i.e. all guards
that wrap it are in the 'open' state.
*/
bool not_exists_opt_is_applicable=
tab->table->reginfo.not_exists_optimize;
for (JOIN_TAB *first_upper= first_unmatched->first_upper;
not_exists_opt_is_applicable && first_upper;
first_upper= first_upper->first_upper)
{
if (!first_upper->found)
not_exists_opt_is_applicable= false;
}
/* Check all predicates that has just been activated. */
/*
Actually all predicates non-guarded by first_unmatched->found
will be re-evaluated again. It could be fixed, but, probably,
it's not worth doing now.
*/
/*
not_exists_optimize has been created from a
select_cond containing 'is_null'. This 'is_null'
predicate is still present on any 'tab' with
'not_exists_optimize'. Furthermore, the usual rules
for condition guards also applies for
'not_exists_optimize' -> When 'is_null==false' we
know all cond. guards are open and we can apply
the 'not_exists_optimize'.
*/
DBUG_ASSERT(!(tab->table->reginfo.not_exists_optimize &&
!tab->select_cond));
if (tab->select_cond && !tab->select_cond->val_int())
{
/* The condition attached to table tab is false */
if (tab == join_tab)
{
found= 0;
if (not_exists_opt_is_applicable)
DBUG_RETURN(NESTED_LOOP_NO_MORE_ROWS);
}
else
{
@ -18016,21 +18024,10 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
not to the last table of the current nest level.
*/
join->return_tab= tab;
}
if (tab->table->reginfo.not_exists_optimize)
{
/*
When not_exists_optimize is set: No need to further
explore more rows of 'tab' for this partial result.
Any found 'tab' matches are known to evaluate to 'false'.
Returning .._NO_MORE_ROWS will skip rem. 'tab' rows.
*/
DBUG_RETURN(NESTED_LOOP_NO_MORE_ROWS);
}
else if (tab != join_tab)
{
DBUG_RETURN(NESTED_LOOP_OK);
if (not_exists_opt_is_applicable)
DBUG_RETURN(NESTED_LOOP_NO_MORE_ROWS);
else
DBUG_RETURN(NESTED_LOOP_OK);
}
}
}