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Fixed bug mdev-4370.

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Don't try to a histogram if it is not read into the cache for statistical data.
It may happen so if optimizer_use_condition_selectivity is set to 3. This 
setting orders the optimizer not use histograms to calculate selectivity.
This commit is contained in:
Igor Babaev
2013-04-05 11:24:28 -07:00
parent 4079a5dc3f
commit daaa5834c9
5 changed files with 87 additions and 2 deletions
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4
sql/sql_statistics.cc
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@ -3369,7 +3369,7 @@ double get_column_range_cardinality(Field *field,
col_stats->min_value && col_stats->max_value)
{
Histogram *hist= &col_stats->histogram;
if (hist->get_size() > 0)
if (hist->is_available())
{
double pos= field->middle_point_pos(col_stats->min_value,
col_stats->max_value);
@ -3406,7 +3406,7 @@ double get_column_range_cardinality(Field *field,
max_mp_pos= 1.0;
Histogram *hist= &col_stats->histogram;
if (hist->get_size() == 0)
if (!hist->is_available())
sel= (max_mp_pos - min_mp_pos);
else
sel= hist->range_selectivity(min_mp_pos, max_mp_pos);