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#include <AggregateFunctions/AggregateFunctionResample.h>
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
class AggregateFunctionCombinatorResample final : public IAggregateFunctionCombinator
{
public:
String getName() const override
{
return "Resample";
}
DataTypes transformArguments(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Incorrect number of arguments for aggregate function with {} suffix", getName());
return DataTypes(arguments.begin(), arguments.end() - 1);
}
Array transformParameters(const Array & params) const override
{
if (params.size() < 3)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Incorrect number of parameters for aggregate function with {} suffix", getName());
return Array(params.begin(), params.end() - 3);
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function,
const AggregateFunctionProperties &,
const DataTypes & arguments,
const Array & params) const override
{
WhichDataType which{arguments.back()};
if (which.isNativeUInt() || which.isDate() || which.isDateTime() || which.isDateTime64())
{
UInt64 begin = params[params.size() - 3].safeGet<UInt64>();
UInt64 end = params[params.size() - 2].safeGet<UInt64>();
UInt64 step = params[params.size() - 1].safeGet<UInt64>();
return std::make_shared<AggregateFunctionResample<UInt64>>(
nested_function,
begin,
end,
step,
arguments,
params);
}
if (which.isNativeInt() || which.isEnum() || which.isInterval())
{
Int64 begin, end;
// notice: UInt64 -> Int64 may lead to overflow
if (!params[params.size() - 3].tryGet<Int64>(begin))
begin = params[params.size() - 3].safeGet<UInt64>();
if (!params[params.size() - 2].tryGet<Int64>(end))
end = params[params.size() - 2].safeGet<UInt64>();
UInt64 step = params[params.size() - 1].safeGet<UInt64>();
return std::make_shared<AggregateFunctionResample<Int64>>(
nested_function,
begin,
end,
step,
arguments,
params);
}
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal types of argument for aggregate function {}, the type "
"of the last argument should be native integer or integer-like", getName());
}
};
}
void registerAggregateFunctionCombinatorResample(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorResample>());
}
}
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