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#include <AggregateFunctions/AggregateFunctionArray.h>
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
#include <Common/typeid_cast.h>
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
namespace
{
class AggregateFunctionCombinatorArray final : public IAggregateFunctionCombinator
{
public:
String getName() const override { return "Array"; }
bool supportsNesting() const override { return true; }
DataTypes transformArguments(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "-Array aggregate functions require at least one argument");
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(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument"
" for aggregate function with {} suffix. Must be array.", type->getName(), getName());
}
return nested_arguments;
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function,
const AggregateFunctionProperties &,
const DataTypes & arguments,
const Array & params) const override
{
return std::make_shared<AggregateFunctionArray>(nested_function, arguments, params);
}
};
}
void registerAggregateFunctionCombinatorArray(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorArray>());
}
}
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