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Merge: Make EXPLAIN better at displaying MRR/BKA

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This commit is contained in:
Sergey Petrunya
2011-04-04 12:38:08 +04:00
parent 69c5b501e5 d4ce827226
commit 2a498b393a
51 changed files with 655 additions and 482 deletions
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18
sql/sql_select.cc
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@ -19648,12 +19648,30 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
if (table->reginfo.not_exists_optimize)
extra.append(STRING_WITH_LEN("; Not exists"));
/*
if (quick_type == QUICK_SELECT_I::QS_TYPE_RANGE &&
!(((QUICK_RANGE_SELECT*)(tab->select->quick))->mrr_flags &
HA_MRR_USE_DEFAULT_IMPL))
{
extra.append(STRING_WITH_LEN("; Using MRR"));
}
*/
if (quick_type == QUICK_SELECT_I::QS_TYPE_RANGE)
{
char mrr_str_buf[128];
mrr_str_buf[0]=0;
int len;
uint mrr_flags=
((QUICK_RANGE_SELECT*)(tab->select->quick))->mrr_flags;
len= table->file->multi_range_read_explain_info(mrr_flags,
mrr_str_buf,
sizeof(mrr_str_buf));
if (len > 0)
{
extra.append(STRING_WITH_LEN("; "));
extra.append(mrr_str_buf, len);
}
}
if (need_tmp_table)
{