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manual merge

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This commit is contained in:
ramil@mysql.com
2005-03-03 14:29:37 +04:00
parent 29ea973a57 89d44e039e
commit de1153b5e6
3 changed files with 34 additions and 21 deletions
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33
sql/sql_union.cc
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@ -217,8 +217,6 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
thd_arg->lex->current_select= sl;
set_limit(sl, sl);
if (sl->braces)
sl->options&= ~OPTION_FOUND_ROWS;
can_skip_order_by= is_union &&
(!sl->braces || select_limit_cnt == HA_POS_ERROR);
@ -342,10 +340,9 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
if (arena->is_stmt_prepare())
{
/* prepare fake select to initialize it correctly */
ulong options_tmp= init_prepare_fake_select_lex(thd);
(void) init_prepare_fake_select_lex(thd);
/*
it should be done only once (because item_list builds only onece
per statement)
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,
@ -452,21 +449,14 @@ bool st_select_lex_unit::exec()
if (select_limit_cnt < sl->select_limit)
select_limit_cnt= HA_POS_ERROR; // no limit
/*
When using braces, SQL_CALC_FOUND_ROWS affects the whole query.
We don't calculate found_rows() per union part
*/
if (select_limit_cnt == HA_POS_ERROR || sl->braces)
sl->options&= ~OPTION_FOUND_ROWS;
else
{
/*
We are doing an union without braces. In this case
SQL_CALC_FOUND_ROWS should be done on all sub parts
*/
sl->options|= found_rows_for_union;
}
sl->join->select_options=sl->options;
/*
When using braces, SQL_CALC_FOUND_ROWS affects the whole query:
we don't calculate found_rows() per union part.
Otherwise, SQL_CALC_FOUND_ROWS should be done on all sub parts.
*/
sl->join->select_options=
(select_limit_cnt == HA_POS_ERROR || sl->braces) ?
sl->options & ~OPTION_FOUND_ROWS : sl->options | found_rows_for_union;
res= sl->join->optimize();
}
if (!res)
@ -498,7 +488,8 @@ bool st_select_lex_unit::exec()
}
/* Needed for the following test and for records_at_start in next loop */
table->file->info(HA_STATUS_VARIABLE);
if (found_rows_for_union & sl->options)
if (found_rows_for_union && !sl->braces &&
select_limit_cnt != HA_POS_ERROR)
{
/*
This is a union without braces. Remember the number of rows that