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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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6
sql/sql_select.h
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@@ -952,6 +952,9 @@ public:
double prefix_record_count;
/* Cost for the join prefix */
double prefix_cost;
/*
NULL - 'index' or 'range' or 'index_merge' or 'ALL' access is used.
Other - [eq_]ref[_or_null] access is used. Pointer to {t.keypart1 = expr}
@@ -983,9 +986,6 @@ public:
LooseScan_picker loosescan_picker;
Sj_materialization_picker sjmat_picker;
/* Cumulative cost and record count for the join prefix */
Cost_estimate prefix_cost;
/*
Current optimization state: Semi-join strategy to be used for this
and preceding join tables.