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Semi-join fixes: make COST_VECT objects survive add_io(add_io_cnt=0, add_avg_cost=...) calls without

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getting NaN in internal fields.
This commit is contained in:
Sergey Petrunya 2011-07-09 16:33:40 +04:00
parent 0ce603ab5e
commit 9e7495df83
1 changed files with 8 additions and 4 deletions
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12
sql/handler.h
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@ -1390,10 +1390,14 @@ public:
}
void add_io(double add_io_cnt, double add_avg_cost)
{
double io_count_sum= io_count + add_io_cnt;
avg_io_cost= (io_count * avg_io_cost +
add_io_cnt * add_avg_cost) / io_count_sum;
io_count= io_count_sum;
/* In edge cases add_io_cnt may be zero */
if (add_io_cnt > 0)
{
double io_count_sum= io_count + add_io_cnt;
avg_io_cost= (io_count * avg_io_cost +
add_io_cnt * add_avg_cost) / io_count_sum;
io_count= io_count_sum;
}
}
/*