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Sergei Petrunia
2014-09-24 11:56:22 +04:00
parent d0a5f33ccd
commit f5d845426e
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sql/sql_select.cc
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@@ -24707,6 +24707,11 @@ void JOIN::cache_const_exprs()
- quick and ref(const) use different cost formulas, so if both are possible - quick and ref(const) use different cost formulas, so if both are possible
we should make a cost-based choice. we should make a cost-based choice.
@param tab JOIN_TAB with table access (is NULL for single-table
UPDATE/DELETE)
@param read_time OUT Cost of reading using quick or ref(const) access.
@return @return
true There was a possible quick or ref access, its cost is in the OUT true There was a possible quick or ref access, its cost is in the OUT
parameters. parameters.