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#include <Columns/ColumnTuple.h>
#include <DataTypes/DataTypeTuple.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/IFunction.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_COLUMN;
}
/// tupleConcat(tup1, ...) - concatenate tuples.
class FunctionTupleConcat : public IFunction
{
public:
static constexpr auto name = "tupleConcat";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionTupleConcat>(); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Function {} requires at least one argument.",
getName());
DataTypes tuple_arg_types;
for (const auto arg_idx : collections::range(0, arguments.size()))
{
const auto * arg = arguments[arg_idx].get();
if (!isTuple(arg))
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument {} of function {}",
arg->getName(),
arg_idx + 1,
getName());
const auto * type = checkAndGetDataType<DataTypeTuple>(arg);
for (const auto & elem : type->getElements())
tuple_arg_types.push_back(elem);
}
return std::make_shared<DataTypeTuple>(tuple_arg_types);
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t) const override
{
const size_t num_arguments = arguments.size();
Columns columns;
for (size_t i = 0; i < num_arguments; i++)
{
const DataTypeTuple * arg_type = checkAndGetDataType<DataTypeTuple>(arguments[i].type.get());
if (!arg_type)
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument {} of function {}",
arguments[i].type->getName(),
i + 1,
getName());
ColumnPtr arg_col = arguments[i].column->convertToFullColumnIfConst();
const ColumnTuple * tuple_col = checkAndGetColumn<ColumnTuple>(arg_col.get());
if (!tuple_col)
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Illegal column {} of argument of function {}",
arguments[i].column->getName(),
getName());
for (const auto & inner_col : tuple_col->getColumns())
columns.push_back(inner_col);
}
return ColumnTuple::create(columns);
}
};
REGISTER_FUNCTION(TupleConcat)
{
factory.registerFunction<FunctionTupleConcat>();
}
}
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