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Split cost calculations into fetch and total

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This patch causes no changes in costs or result files.

Changes:
- Store row compare cost separately in Cost_estimate::comp_cost
- Store cost of fetching rows separately in OPT_RANGE
- Use range->fetch_cost instead of adjust_quick_cost(total_cost)

This was done to simplify cost calculation in sql_select.cc:
- We can use range->fetch_cost directly without having to call
  adjust_quick_cost(). adjust_quick_cost() is now removed.

Other things:
- Removed some not used functions in Cost_estimate
This commit is contained in:
Monty
2021-10-21 19:40:58 +03:00
committed by Sergei Petrunia
parent 766bae2b31
commit e6205c966d
5 changed files with 42 additions and 42 deletions
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4
sql/opt_range.cc
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@@ -11764,7 +11764,9 @@ ha_rows check_quick_select(PARAM *param, uint idx, bool index_only,
param->table->opt_range_condition_rows=
MY_MIN(param->table->opt_range_condition_rows, rows);
range->rows= rows;
range->cost= cost->total_cost();
range->fetch_cost= cost->fetch_cost();
/* Same as total cost */
range->cost= range->fetch_cost + cost->compare_cost();
if (param->table->file->is_clustering_key(keynr))
range->index_only_cost= 0;
else