void Analyzer::compute_attribute_stat(const AttributeID& attr_id) {
TableStatistic* tab_stat =
StatManager::getInstance()->getTableStatistic(attr_id.table_id);
assert(tab_stat != 0);
if (tab_stat->getAttributeStatistics(attr_id)) {
printf("attribute statistics is already existed!\n");
return;
}
unsigned long distinct_cardinality;
if (Catalog::getInstance()
->getTable(attr_id.table_id)
->getAttribute(attr_id.offset)
.isUnique()) {
/**
* for attribute that has UNIQUE property, gathering the number of distinct
* values is unnecessary.
*/
distinct_cardinality = tab_stat->number_of_tuples_;
} else {
distinct_cardinality = Analyzer::getDistinctCardinality(attr_id);
}
AttributeStatistics* attr_stat = new AttributeStatistics();
attr_stat->setDistinctCardinality(distinct_cardinality);
printf("Distinct values:%d\n", distinct_cardinality);
if (Analyzer::isBeneficalFromHistrogram(distinct_cardinality,
tab_stat->number_of_tuples_)) {
// Analyzer::analyse(attr_id);
Histogram* his = Analyzer::computeHistogram(
attr_id, decideNumberOfBucketsForHistogram(
distinct_cardinality, tab_stat->number_of_tuples_));
his->Print(Catalog::getInstance()
->getTable(attr_id.table_id)
->getAttribute(attr_id.offset)
.attrType->type);
attr_stat->setHistogram(his);
}
attr_stat->print();
printf("----%s----\n", Catalog::getInstance()
->getTable(attr_id.table_id)
->getAttribute(attr_id.offset)
.getName()
.c_str());
tab_stat->addAttributeStatistics(attr_id, attr_stat);
}
//================================================
void DynamicalGraph::DiversityHistoOutput( const char* filename) {
std::ofstream fout(filename);
diversity_histo.Print( fout );
fout.close();
}
//================================================
void DynamicalGraph::ExtinctionSizeHistoOutput( const char* filename) {
std::ofstream fout(filename);
extinction_histo.Print( fout );
fout.close();
}
//================================================
void DynamicalGraph::LifetimeHistoOutput( const char* filename) {
std::ofstream fout(filename);
lifetime_histo.Print( fout );
fout.close();
}