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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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30
dbcon/mysql/ha_mcs_impl.cpp
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@@ -136,10 +136,36 @@ namespace cal_impl_if
{
extern bool nonConstFunc(Item_func* ifp);
void gp_walk_info::mergeColumnStatisticsMap(const ColumnStatisticsMap& aColumnStatisticsMap)
void gp_walk_info::mergeTableStatistics(const TableStatisticsMap& aTableStatisticsMap)
{
columnStatisticsMap.insert(aColumnStatisticsMap.begin(), aColumnStatisticsMap.end());
for (auto& [schemaAndTableName, aColumnStatisticsMap]: aTableStatisticsMap)
{
auto tableStatisticsMapIt = tableStatisticsMap.find(schemaAndTableName);
if (tableStatisticsMapIt == tableStatisticsMap.end())
{
tableStatisticsMap[schemaAndTableName] = aColumnStatisticsMap;
}
else
{
for (auto& [columnName, histogram]: aColumnStatisticsMap)
{
tableStatisticsMapIt->second[columnName] = histogram;
}
}
}
}
std::optional<ColumnStatisticsMap> gp_walk_info::findStatisticsForATable(SchemaAndTableName& schemaAndTableName)
{
auto tableStatisticsMapIt = tableStatisticsMap.find(schemaAndTableName);
if (tableStatisticsMapIt == tableStatisticsMap.end())
{
return std::nullopt;
}
return {tableStatisticsMapIt->second};
}
}
namespace