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#include "AggregateFunctionMap.h"
#include "AggregateFunctions/AggregateFunctionCombinatorFactory.h"
#include "Functions/FunctionHelpers.h"
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
class AggregateFunctionCombinatorMap final : public IAggregateFunctionCombinator
{
public:
String getName() const override { return "Map"; }
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());
const auto * map_type = checkAndGetDataType<DataTypeMap>(arguments[0].get());
if (map_type)
{
if (arguments.size() > 1)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "{} combinator takes only one map argument", getName());
return DataTypes({map_type->getValueType()});
}
// we need this part just to pass to redirection for mapped arrays
auto check_func = [](DataTypePtr t) { return t->getTypeId() == TypeIndex::Array; };
const auto * tup_type = checkAndGetDataType<DataTypeTuple>(arguments[0].get());
if (tup_type)
{
const auto & types = tup_type->getElements();
bool arrays_match = arguments.size() == 1 && types.size() >= 2 && std::all_of(types.begin(), types.end(), check_func);
if (arrays_match)
{
const auto * val_array_type = assert_cast<const DataTypeArray *>(types[1].get());
return DataTypes({val_array_type->getNestedType()});
}
}
else
{
bool arrays_match = arguments.size() >= 2 && std::all_of(arguments.begin(), arguments.end(), check_func);
if (arrays_match)
{
const auto * val_array_type = assert_cast<const DataTypeArray *>(arguments[1].get());
return DataTypes({val_array_type->getNestedType()});
}
}
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Aggregate function {} requires map as argument", getName());
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function,
const AggregateFunctionProperties &,
const DataTypes & arguments,
const Array & params) const override
{
const auto * map_type = checkAndGetDataType<DataTypeMap>(arguments[0].get());
if (map_type)
{
const auto & key_type = map_type->getKeyType();
switch (key_type->getTypeId())
{
case TypeIndex::Enum8:
case TypeIndex::Int8:
return std::make_shared<AggregateFunctionMap<Int8>>(nested_function, arguments);
case TypeIndex::Enum16:
case TypeIndex::Int16:
return std::make_shared<AggregateFunctionMap<Int16>>(nested_function, arguments);
case TypeIndex::Int32:
return std::make_shared<AggregateFunctionMap<Int32>>(nested_function, arguments);
case TypeIndex::Int64:
return std::make_shared<AggregateFunctionMap<Int64>>(nested_function, arguments);
case TypeIndex::Int128:
return std::make_shared<AggregateFunctionMap<Int128>>(nested_function, arguments);
case TypeIndex::Int256:
return std::make_shared<AggregateFunctionMap<Int256>>(nested_function, arguments);
case TypeIndex::UInt8:
return std::make_shared<AggregateFunctionMap<UInt8>>(nested_function, arguments);
case TypeIndex::Date:
case TypeIndex::UInt16:
return std::make_shared<AggregateFunctionMap<UInt16>>(nested_function, arguments);
case TypeIndex::DateTime:
case TypeIndex::UInt32:
return std::make_shared<AggregateFunctionMap<UInt32>>(nested_function, arguments);
case TypeIndex::UInt64:
return std::make_shared<AggregateFunctionMap<UInt64>>(nested_function, arguments);
case TypeIndex::UInt128:
return std::make_shared<AggregateFunctionMap<UInt128>>(nested_function, arguments);
case TypeIndex::UInt256:
return std::make_shared<AggregateFunctionMap<UInt256>>(nested_function, arguments);
case TypeIndex::UUID:
return std::make_shared<AggregateFunctionMap<UUID>>(nested_function, arguments);
case TypeIndex::IPv4:
return std::make_shared<AggregateFunctionMap<IPv4>>(nested_function, arguments);
case TypeIndex::IPv6:
return std::make_shared<AggregateFunctionMap<IPv6>>(nested_function, arguments);
case TypeIndex::FixedString:
case TypeIndex::String:
return std::make_shared<AggregateFunctionMap<String>>(nested_function, arguments);
default:
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Map key type {} is not is not supported by combinator {}", key_type->getName(), getName());
}
}
else
{
// in case of tuple of arrays or just arrays (checked in transformArguments), try to redirect to sum/min/max-MappedArrays to implement old behavior
auto nested_func_name = nested_function->getName();
if (nested_func_name == "sum" || nested_func_name == "min" || nested_func_name == "max")
{
AggregateFunctionProperties out_properties;
auto & aggr_func_factory = AggregateFunctionFactory::instance();
return aggr_func_factory.get(nested_func_name + "MappedArrays", arguments, params, out_properties);
}
else
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Aggregation '{}Map' is not implemented for mapped arrays",
nested_func_name);
}
}
};
void registerAggregateFunctionCombinatorMap(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorMap>());
}
}
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