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Reduced size of POSITION

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Replaced Cost_estimate prefix_cost with a double as prefix_cost was
only used to store and retrive total prefix cost.

This also speeds up things (a bit) as don't have to call
Cost_estimate::total_cost() for every access to the prefix_cost.

Sizeof POSITION decreased from 304 to 256.
This commit is contained in:
Monty
2022-06-03 13:24:18 +03:00
committed by Oleg Smirnov
parent fbbc63453b
commit 1f0187ff8d
3 changed files with 12 additions and 13 deletions
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2
sql/sql_select.cc
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@@ -17945,7 +17945,7 @@ void optimize_wo_join_buffering(JOIN *join, uint first_tab, uint last_tab,
if (first_tab > join->const_tables)
{
cost= join->positions[first_tab - 1].prefix_cost.total_cost();
cost= join->positions[first_tab - 1].prefix_cost;
rec_count= join->positions[first_tab - 1].prefix_record_count;
}
else