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Fixed bug with EXPLAIN on empty table

Browse source 
mysql-test/r/explain.result:
  test of bug with EXPLAIN on empty table
mysql-test/t/explain.test:
  test of bug with EXPLAIN on empty table
This commit is contained in:
unknown 2003-01-20 18:17:14 +02:00
commit f6cbace93e
3 changed files with 37 additions and 28 deletions
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55
sql/sql_select.cc
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@ -7352,36 +7352,39 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
if (tab->info)
item_list.push_back(new Item_string(tab->info,strlen(tab->info)));
else if (tab->select)
else
{
if (tab->use_quick == 2)
if (tab->select)
{
sprintf(buff_ptr,"; Range checked for each record (index map: %u)",
tab->keys);
buff_ptr=strend(buff_ptr);
if (tab->use_quick == 2)
{
sprintf(buff_ptr,"; Range checked for each record (index map: %u)",
tab->keys);
buff_ptr=strend(buff_ptr);
}
else
buff_ptr=strmov(buff_ptr,"; Using where");
}
else
buff_ptr=strmov(buff_ptr,"; Using where");
if (key_read)
buff_ptr= strmov(buff_ptr,"; Using index");
if (table->reginfo.not_exists_optimize)
buff_ptr= strmov(buff_ptr,"; Not exists");
if (need_tmp_table)
{
need_tmp_table=0;
buff_ptr= strmov(buff_ptr,"; Using temporary");
}
if (need_order)
{
need_order=0;
buff_ptr= strmov(buff_ptr,"; Using filesort");
}
if (distinct && test_all_bits(used_tables,thd->used_tables))
buff_ptr= strmov(buff_ptr,"; Distinct");
if (buff_ptr == buff)
buff_ptr+= 2;
item_list.push_back(new Item_string(buff+2,(uint) (buff_ptr - buff)-2));
}
if (key_read)
buff_ptr= strmov(buff_ptr,"; Using index");
if (table->reginfo.not_exists_optimize)
buff_ptr= strmov(buff_ptr,"; Not exists");
if (need_tmp_table)
{
need_tmp_table=0;
buff_ptr= strmov(buff_ptr,"; Using temporary");
}
if (need_order)
{
need_order=0;
buff_ptr= strmov(buff_ptr,"; Using filesort");
}
if (distinct && test_all_bits(used_tables,thd->used_tables))
buff_ptr= strmov(buff_ptr,"; Distinct");
if (buff_ptr == buff)
buff_ptr+= 2;
item_list.push_back(new Item_string(buff+2,(uint) (buff_ptr - buff)-2));
// For next iteration
used_tables|=table->map;
if (result->send_data(item_list))