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Fixed bug mdev-5410.

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The fix for bug #27937 was incomplete: it did not handle correctly the queries
containing UNION with global ORDER BY in subselects.
This commit is contained in:
Igor Babaev
2013-12-12 13:55:33 -08:00
parent fde2777b27
commit 3ec4296ec4
4 changed files with 59 additions and 5 deletions
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17
sql/sql_union.cc
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@@ -184,13 +184,15 @@ void select_union::cleanup()
SYNOPSIS
st_select_lex_unit::init_prepare_fake_select_lex()
thd - thread handler
first_execution - TRUE at the first execution of the union
RETURN
options of SELECT
*/
void
st_select_lex_unit::init_prepare_fake_select_lex(THD *thd_arg)
st_select_lex_unit::init_prepare_fake_select_lex(THD *thd_arg,
bool first_execution)
{
thd_arg->lex->current_select= fake_select_lex;
fake_select_lex->table_list.link_in_list(&result_table_list,
@@ -198,7 +200,13 @@ st_select_lex_unit::init_prepare_fake_select_lex(THD *thd_arg)
fake_select_lex->context.table_list=
fake_select_lex->context.first_name_resolution_table=
fake_select_lex->get_table_list();
if (!fake_select_lex->first_execution)
/*
The flag fake_select_lex->first_execution indicates whether this is
called at the first execution of the statement, while first_execution
shows whether this is called at the first execution of the union that
may form just a subselect.
*/
if (!fake_select_lex->first_execution && first_execution)
{
for (ORDER *order= global_parameters->order_list.first;
order;
@@ -472,7 +480,7 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
{
/* Validate the global parameters of this union */
init_prepare_fake_select_lex(thd);
init_prepare_fake_select_lex(thd, TRUE);
/* Should be done only once (the only item_list per statement) */
DBUG_ASSERT(fake_select_lex->join == 0);
if (!(fake_select_lex->join= new JOIN(thd, item_list, thd->options,
@@ -612,6 +620,7 @@ bool st_select_lex_unit::exec()
SELECT_LEX *select_cursor=first_select();
ulonglong add_rows=0;
ha_rows examined_rows= 0;
bool first_execution= !executed;
DBUG_ENTER("st_select_lex_unit::exec");
if (executed && !uncacheable && !describe)
@@ -714,7 +723,7 @@ bool st_select_lex_unit::exec()
if (!thd->is_fatal_error) // Check if EOM
{
set_limit(global_parameters);
init_prepare_fake_select_lex(thd);
init_prepare_fake_select_lex(thd, first_execution);
JOIN *join= fake_select_lex->join;
if (!join)
{