database/mariadb-columnstore-engine
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feat(rbo,rules): refactored statistics storage in gwi and implemented statistics based UNION rewrite.

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drrtuy
2025-07-17 15:37:20 +00:00
parent 67295b4320
commit 15be33fbc5
6 changed files with 122 additions and 46 deletions
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17
dbcon/mysql/ha_mcs_execplan.cpp
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@@ -6314,16 +6314,20 @@ void extractColumnStatistics(Item_field* ifp, gp_walk_info& gwi)
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
// 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.columnStatisticsMap[ifp->field->field_name.str].size() " << histogramBuckets.size() << std::endl;
gwi.columnStatisticsMap[ifp->field->field_name.str] = histogramBuckets;
// 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;
}
}
}
@@ -6421,7 +6425,7 @@ int processSelect(SELECT_LEX& select_lex, gp_walk_info& gwi, SCSEP& csep, vector
{
Item_field* ifp = (Item_field*)item;
extractColumnStatistics(ifp, gwi);
std::cout << "gwi.columnStatisticsMap 1 size " << gwi.columnStatisticsMap.size() << std::endl;
// Handle * case
if (ifp->field_name.length && string(ifp->field_name.str) == "*")
{
collectAllCols(gwi, ifp);
@@ -7473,7 +7477,6 @@ int cs_get_select_plan(ha_columnstore_select_handler* handler, THD* thd, SCSEP&
int status = getSelectPlan(gwi, select_lex, csep, false, true, isSelectLexUnit);
std::cout << "cs_get_select_plan columnStatisticsMap size " << gwi.columnStatisticsMap.size() << std::endl;
if (status > 0)
return ER_INTERNAL_ERROR;
else if (status < 0)