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#include <memory>
#include <Common/assert_cast.h>
#include <DataTypes/IDataType.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypeArray.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnTuple.h>
#include <Columns/ColumnArray.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int SIZES_OF_ARRAYS_DONT_MATCH;
}
namespace
{
class FunctionNested : public IFunction
{
public:
static constexpr auto name = "nested";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionNested>();
}
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;
}
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override
{
return {0};
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
size_t arguments_size = arguments.size();
if (arguments_size < 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Number of arguments for function {} doesn't match: passed {}, should be at least 2",
getName(),
arguments_size);
Names nested_names = extractNestedNames(arguments[0].column);
if (nested_names.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"First argument for function {} must be constant column with array of strings",
getName());
if (nested_names.size() != arguments_size - 1)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Size of nested names array for function {} does not match arrays arguments size. Actual {}. Expected {}",
getName(),
nested_names.size(),
arguments_size - 1);
DataTypes nested_types;
nested_types.reserve(arguments_size);
for (size_t i = 1; i < arguments_size; ++i)
{
const auto & argument = arguments[i];
const auto * argument_type_array = typeid_cast<const DataTypeArray *>(argument.type.get());
if (!argument_type_array)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Argument {} for function {} must be array. Actual {}",
i + 1,
getName(),
argument.type->getName());
nested_types.push_back(argument_type_array->getNestedType());
}
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeTuple>(nested_types, nested_names));
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t) const override
{
size_t arguments_size = arguments.size();
const auto * lhs_array = assert_cast<const ColumnArray *>(arguments.at(1).column.get());
Columns data_columns;
data_columns.reserve(arguments_size);
data_columns.push_back(lhs_array->getDataPtr());
for (size_t i = 2; i < arguments_size; ++i)
{
const auto * rhs_array = assert_cast<const ColumnArray *>(arguments[i].column.get());
if (!lhs_array->hasEqualOffsets(*rhs_array))
throw Exception(ErrorCodes::SIZES_OF_ARRAYS_DONT_MATCH,
"The argument 2 and argument {} of function {} have different array offsets",
i + 1,
getName());
data_columns.push_back(rhs_array->getDataPtr());
}
auto tuple_column = ColumnTuple::create(std::move(data_columns));
auto array_column = ColumnArray::create(std::move(tuple_column), lhs_array->getOffsetsPtr());
return array_column;
}
private:
static Names extractNestedNames(const ColumnPtr & column)
{
const auto * const_column = typeid_cast<const ColumnConst *>(column.get());
if (!const_column)
return {};
Field nested_names_field;
const_column->get(0, nested_names_field);
if (nested_names_field.getType() != Field::Types::Array)
return {};
const auto & nested_names_array = nested_names_field.get<const Array &>();
Names nested_names;
nested_names.reserve(nested_names_array.size());
for (const auto & nested_name_field : nested_names_array)
{
if (nested_name_field.getType() != Field::Types::String)
return {};
nested_names.push_back(nested_name_field.get<const String &>());
}
return nested_names;
}
};
}
REGISTER_FUNCTION(Nested)
{
factory.registerFunction<FunctionNested>(FunctionDocumentation{
.description=R"(
Returns the array of tuples from multiple arrays.
)",
.examples{{"nested", "SELECT nested(['keys', 'values'], ['key_1', 'key_2'], ['value_1','value_2'])", ""}},
.categories{"OtherFunctions"}
});
}
}
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