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#include <AggregateFunctions/AggregateFunctionHistogram.h>
#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <AggregateFunctions/FactoryHelpers.h>
#include <AggregateFunctions/Helpers.h>
#include <Common/FieldVisitorConvertToNumber.h>
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int BAD_ARGUMENTS;
extern const int UNSUPPORTED_PARAMETER;
extern const int PARAMETER_OUT_OF_BOUND;
}
namespace
{
AggregateFunctionPtr createAggregateFunctionHistogram(const std::string & name, const DataTypes & arguments, const Array & params, const Settings *)
{
if (params.size() != 1)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} requires single parameter: bins count", name);
if (params[0].getType() != Field::Types::UInt64)
throw Exception(ErrorCodes::UNSUPPORTED_PARAMETER, "Invalid type for bins count");
UInt32 bins_count = applyVisitor(FieldVisitorConvertToNumber<UInt32>(), params[0]);
auto limit = AggregateFunctionHistogramData::bins_count_limit;
if (bins_count > limit)
throw Exception(ErrorCodes::PARAMETER_OUT_OF_BOUND, "Unsupported bins count. Should not be greater than {}", limit);
if (bins_count == 0)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Bin count should be positive");
assertUnary(name, arguments);
AggregateFunctionPtr res(createWithNumericType<AggregateFunctionHistogram>(*arguments[0], bins_count, arguments, params));
if (!res)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument for aggregate function {}", arguments[0]->getName(), name);
return res;
}
}
void registerAggregateFunctionHistogram(AggregateFunctionFactory & factory)
{
factory.registerFunction("histogram", createAggregateFunctionHistogram);
}
}
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