mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-14 02:12:21 +00:00
70d1adfe4b
* save format string for NetException * format exceptions * format exceptions 2 * format exceptions 3 * format exceptions 4 * format exceptions 5 * format exceptions 6 * fix * format exceptions 7 * format exceptions 8 * Update MergeTreeIndexGin.cpp * Update AggregateFunctionMap.cpp * Update AggregateFunctionMap.cpp * fix
80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
#include <Functions/IFunction.h>
|
|
#include <Functions/FunctionFactory.h>
|
|
#include <Functions/FunctionHelpers.h>
|
|
#include <DataTypes/DataTypeAggregateFunction.h>
|
|
#include <Columns/ColumnAggregateFunction.h>
|
|
#include <Common/typeid_cast.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int ILLEGAL_COLUMN;
|
|
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
|
|
}
|
|
|
|
namespace
|
|
{
|
|
|
|
/** finalizeAggregation(agg_state) - get the result from the aggregation state.
|
|
* Takes state of aggregate function. Returns result of aggregation (finalized state).
|
|
*/
|
|
class FunctionFinalizeAggregation : public IFunction
|
|
{
|
|
public:
|
|
static constexpr auto name = "finalizeAggregation";
|
|
static FunctionPtr create(ContextPtr)
|
|
{
|
|
return std::make_shared<FunctionFinalizeAggregation>();
|
|
}
|
|
|
|
String getName() const override
|
|
{
|
|
return name;
|
|
}
|
|
|
|
size_t getNumberOfArguments() const override
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
|
|
|
|
bool useDefaultImplementationForConstants() const override { return true; }
|
|
|
|
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
|
|
{
|
|
const DataTypeAggregateFunction * type = checkAndGetDataType<DataTypeAggregateFunction>(arguments[0].get());
|
|
if (!type)
|
|
{
|
|
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
|
|
"Argument for function '{}' must have type AggregateFunction - state of aggregate function."
|
|
" Got '{}' instead", getName(), arguments[0]->getName());
|
|
}
|
|
|
|
return type->getReturnType();
|
|
}
|
|
|
|
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
|
|
{
|
|
auto column = arguments.at(0).column;
|
|
if (!typeid_cast<const ColumnAggregateFunction *>(column.get()))
|
|
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}",
|
|
arguments.at(0).column->getName(), getName());
|
|
|
|
/// Column is copied here, because there is no guarantee that we own it.
|
|
auto mut_column = IColumn::mutate(std::move(column));
|
|
return ColumnAggregateFunction::convertToValues(std::move(mut_column));
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
REGISTER_FUNCTION(FinalizeAggregation)
|
|
{
|
|
factory.registerFunction<FunctionFinalizeAggregation>();
|
|
}
|
|
|
|
}
|