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#include <Columns/ColumnTuple.h>
#include <Columns/ColumnArray.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypeArray.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <IO/WriteHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int SIZES_OF_ARRAYS_DONT_MATCH;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_COLUMN;
}
/// arrayZip(['a', 'b', 'c'], ['d', 'e', 'f']) = [('a', 'd'), ('b', 'e'), ('c', 'f')]
class FunctionArrayZip : public IFunction
{
public:
static constexpr auto name = "arrayZip";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayZip>(); }
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Function {} needs at least one argument; passed {}." , getName(), arguments.size());
DataTypes arguments_types;
for (size_t index = 0; index < arguments.size(); ++index)
{
const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[index].type.get());
if (!array_type)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Argument {} of function {} must be array. Found {} instead.",
toString(index + 1), getName(), arguments[0].type->getName());
arguments_types.emplace_back(array_type->getNestedType());
}
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeTuple>(arguments_types));
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
size_t num_arguments = arguments.size();
ColumnPtr first_array_column;
Columns tuple_columns(num_arguments);
for (size_t i = 0; i < num_arguments; ++i)
{
/// Constant columns cannot be inside tuple. It's only possible to have constant tuple as a whole.
ColumnPtr holder = arguments[i].column->convertToFullColumnIfConst();
const ColumnArray * column_array = checkAndGetColumn<ColumnArray>(holder.get());
if (!column_array)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Argument {} of function {} must be array. Found column {} instead.",
i + 1, getName(), holder->getName());
if (i == 0)
{
first_array_column = holder;
}
else if (!column_array->hasEqualOffsets(static_cast<const ColumnArray &>(*first_array_column)))
{
throw Exception(ErrorCodes::SIZES_OF_ARRAYS_DONT_MATCH,
"The argument 1 and argument {} of function {} have different array sizes",
i + 1, getName());
}
tuple_columns[i] = column_array->getDataPtr();
}
return ColumnArray::create(
ColumnTuple::create(tuple_columns), static_cast<const ColumnArray &>(*first_array_column).getOffsetsPtr());
}
};
REGISTER_FUNCTION(ArrayZip)
{
factory.registerFunction<FunctionArrayZip>();
}
}
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