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#include <AggregateFunctions/AggregateFunctionMerge.h>
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
#include <DataTypes/DataTypeAggregateFunction.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
class AggregateFunctionCombinatorMerge final : public IAggregateFunctionCombinator
{
public:
String getName() const override { return "Merge"; }
DataTypes transformArguments(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception(
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Incorrect number of arguments for aggregate function with {} suffix",
getName());
const DataTypePtr & argument = arguments[0];
const DataTypeAggregateFunction * function = typeid_cast<const DataTypeAggregateFunction *>(argument.get());
if (!function)
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument for aggregate function with {} suffix. It must be AggregateFunction(...)",
argument->getName(),
getName());
return function->getArgumentsDataTypes();
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function,
const AggregateFunctionProperties &,
const DataTypes & arguments,
const Array & params) const override
{
const DataTypePtr & argument = arguments[0];
const DataTypeAggregateFunction * function = typeid_cast<const DataTypeAggregateFunction *>(argument.get());
if (!function)
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument for aggregate function with {} suffix. It must be AggregateFunction(...)",
argument->getName(),
getName());
if (!nested_function->haveSameStateRepresentation(*function->getFunction()))
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument for aggregate function with {} suffix. because it corresponds to different aggregate "
"function: {} instead of {}",
argument->getName(),
getName(),
function->getFunctionName(),
nested_function->getName());
return std::make_shared<AggregateFunctionMerge>(nested_function, argument, params);
}
};
}
void registerAggregateFunctionCombinatorMerge(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorMerge>());
}
}
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