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feat(rbo,rules): use EI statistics for filter ranges

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drrtuy
2025-07-18 13:41:30 +00:00
parent 428be12b9b
commit e600f11aa9
3 changed files with 14 additions and 134 deletions
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27
dbcon/mysql/ha_mcs_execplan.cpp
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@@ -6288,44 +6288,23 @@ int processLimitAndOffset(SELECT_LEX& select_lex, gp_walk_info& gwi, SCSEP& csep
return 0;
}
// Loop over available indexes to find and extract corresponding EI column statistics
// for the first column of the index if any.
// Statistics is stored in GWI context.
void extractColumnStatistics(Item_field* ifp, gp_walk_info& gwi)
{
// TODO find clear way to check if the field is part of a key
// if (!ifp->field->part_of_key.is_clear_all())
// {
// return;
// }
// std::cout << "Processing field item: " << ifp->field_name.str << std::endl;
// std::cout << "part of a key: " << buf << std::endl;
// std::cout << "ifp->field->field_index " << ifp->field->field_index << std::endl;
for (uint j = 0; j < ifp->field->table->s->keys; j++)
{
for (uint i = 0; i < ifp->field->table->s->key_info[j].usable_key_parts; i++)
{
// std::cout << "key fieldnr " << i << " "
// << ifp->field->table->s->key_info[j].key_part[i].field->field_name.str << " "
// << ifp->field->table->s->key_info[j].key_part[i].fieldnr << std::endl;
if (ifp->field->table->s->key_info[j].key_part[i].fieldnr == ifp->field->field_index + 1)
{
// std::cout << "key_info " << j << " key_part " << i << " matched " << std::endl;
if (i == 0 && ifp->field->read_stats)
{
assert(ifp->field->table->s);
// assert(ifp->field->table->s->db);
// assert(ifp->field->table->s->table_name);
// FQCN fqcn({ifp->field->table->s->db.str}, {ifp->field->table->s->table_name.str},
// {ifp->field->field_name.str});
// TODO use FQCN as a key type
std::cout << "Adding column statistics for " << ifp->field->field_name.str << std::endl;
auto* histogram = dynamic_cast<Histogram_json_hb*>(ifp->field->read_stats->histogram);
if (histogram)
{
std::cout << "Type of histogram object: " << typeid(*histogram).name() << std::endl;
// std::vector<Histogram_bucket> histogramBuckets = histogram->get_json_histogram();
// std::cout << "gwi.tableStatisticsMap[{ifp->field->table->s->db.str, "
// "ifp->field->table->s->table_name.str}][ifp->field->field_name.str].size() "
// << histogramBuckets.size() << std::endl;
SchemaAndTableName tableName = {ifp->field->table->s->db.str, ifp->field->table->s->table_name.str};
gwi.tableStatisticsMap[tableName][ifp->field->field_name.str] = *histogram;
}