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Merge gshchepa@bk-internal.mysql.com:/home/bk/mysql-5.1-opt

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into  gleb.loc:/home/uchum/work/bk/5.1-opt
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gshchepa/uchum@gleb.loc
2007-07-31 13:23:56 +05:00
parent 39c77427a6 d72a6b1227
commit 355c25f0c2
6 changed files with 105 additions and 1 deletions
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4
sql/sql_select.cc
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@@ -1134,6 +1134,7 @@ JOIN::optimize()
order=0; // The output has only one row
simple_order=1;
select_distinct= 0; // No need in distinct for 1 row
group_optimized_away= 1;
}
calc_group_buffer(this, group_list);
@@ -11742,7 +11743,8 @@ end_send_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
if (!join->first_record || end_of_records ||
(idx=test_if_group_changed(join->group_fields)) >= 0)
{
if (join->first_record || (end_of_records && !join->group))
if (join->first_record ||
(end_of_records && !join->group && !join->group_optimized_away))
{
if (join->procedure)
join->procedure->end_group();

9
sql/sql_select.h
View File

@@ -321,6 +321,14 @@ public:
ROLLUP rollup; // Used with rollup
bool select_distinct; // Set if SELECT DISTINCT
/*
If we have the GROUP BY statement in the query,
but the group_list was emptied by optimizer, this
flag is TRUE.
It happens when fields in the GROUP BY are from
constant table
*/
bool group_optimized_away;
/*
simple_xxxxx is set if ORDER/GROUP BY doesn't include any references
@@ -429,6 +437,7 @@ public:
zero_result_cause= 0;
optimized= 0;
cond_equal= 0;
group_optimized_away= 0;
all_fields= fields_arg;
fields_list= fields_arg;