thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-11 18:14:03 +00:00
Code Issues Packages Projects Releases Wiki Activity

AggregateFunctionSumMap: compact keys with zero value

Browse Source 
This allows `sumMap(k, v)` to compact all keys
for which the values are all zero.
This commit is contained in:
Marek Vavruša 2017-10-17 14:15:32 -07:00 committed by alexey-milovidov
parent 65982a1642
commit fa098b469c
1 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
dbms/src/AggregateFunctions/AggregateFunctionSumMap.h
View File

@ -198,7 +198,27 @@ public:
void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
{ {
const auto & merged_maps = this->data(place).merged_maps; // Final step does compaction of keys that have zero values, this mutates the state
auto & merged_maps = this->data(const_cast<AggregateDataPtr>(place)).merged_maps;
for (auto it = merged_maps.cbegin(); it != merged_maps.cend();)
{
// Key is not compacted if it has at least one non-zero value
bool erase = true;
for (size_t col = 0; col < values_types.size(); ++col)
{
if (it->second[col] != values_types[col]->getDefault())
{
erase = false;
break;
}
}
if (erase)
it = merged_maps.erase(it);
else
++it;
}
size_t size = merged_maps.size(); size_t size = merged_maps.size();
auto & to_cols = static_cast<ColumnTuple &>(to).getColumns(); auto & to_cols = static_cast<ColumnTuple &>(to).getColumns();