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Fix compile error and test failure:

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- Don't use 'res' uninitialized
- multiply it by col_non_nulls before set_if_bigger(...) call.
This commit is contained in:
Sergei Petrunia 2021-08-27 16:49:45 +03:00
parent 096995b106
commit a48e63c5fe
1 changed files with 3 additions and 2 deletions
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5
sql/sql_statistics.cc
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@ -4369,8 +4369,8 @@ double get_column_range_cardinality(Field *field,
if (hist && hist->is_usable(thd))
{
sel= hist->range_selectivity(field, min_endp, max_endp);
set_if_bigger(res, col_stats->get_avg_frequency());
} else
}
else
{
double min_mp_pos, max_mp_pos;
if (min_endp && !(field->null_ptr && min_endp->key[0]))
@ -4395,6 +4395,7 @@ double get_column_range_cardinality(Field *field,
sel = (max_mp_pos - min_mp_pos);
}
res= col_non_nulls * sel;
set_if_bigger(res, col_stats->get_avg_frequency());
}
else
res= col_non_nulls;