ClickHouse/dbms/AggregateFunctions/AggregateFunctionForEach.cpp
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

48 lines
1.5 KiB
C++

#include <AggregateFunctions/AggregateFunctionForEach.h>
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
#include <Common/typeid_cast.h>
#include "registerAggregateFunctions.h"
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
class AggregateFunctionCombinatorForEach final : public IAggregateFunctionCombinator
{
public:
String getName() const override { return "ForEach"; }
DataTypes transformArguments(const DataTypes & arguments) const override
{
DataTypes nested_arguments;
for (const auto & type : arguments)
{
if (const DataTypeArray * array = typeid_cast<const DataTypeArray *>(type.get()))
nested_arguments.push_back(array->getNestedType());
else
throw Exception("Illegal type " + type->getName() + " of argument"
" for aggregate function with " + getName() + " suffix. Must be array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
return nested_arguments;
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function, const DataTypes & arguments, const Array &) const override
{
return std::make_shared<AggregateFunctionForEach>(nested_function, arguments);
}
};
void registerAggregateFunctionCombinatorForEach(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorForEach>());
}
}