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MDEV-406: ANALYZE $stmt

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- Support tracking for UNIONs, temporary-table based ORDER BYs,
  and both.
This commit is contained in:
Sergei Petrunia
2014-06-03 17:59:01 +04:00
parent 0925ab9d88
commit 5621aa3230
6 changed files with 79 additions and 17 deletions
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6
sql/sql_explain.cc
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@@ -542,7 +542,7 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
/* `r_rows` */
if (is_analyze)
{
ha_rows avg_rows= r_scans ? round((double) r_rows / r_scans): 0;
ha_rows avg_rows= tracker.r_scans ? round((double) tracker.r_rows / tracker.r_scans): 0;
item_list.push_back(new Item_int((longlong) (ulonglong) avg_rows,
MY_INT64_NUM_DECIMAL_DIGITS));
}
@@ -562,8 +562,8 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
if (is_analyze)
{
double r_filtered;
if (r_rows > 0)
r_filtered= 100.0 * (double)r_rows_after_table_cond / r_rows;
if (tracker.r_rows > 0)
r_filtered= 100.0 * (double)tracker.r_rows_after_table_cond / tracker.r_rows;
else
r_filtered= 100.0;
item_list.push_back(new Item_float(r_filtered, 2));