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#pragma once
#include <Functions/IFunction.h>
#include <Functions/GatherUtils/GatherUtils.h>
#include <DataTypes/DataTypeArray.h>
#include <Columns/ColumnArray.h>
#include <Common/typeid_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
class FunctionArrayPop : public IFunction
{
public:
FunctionArrayPop(bool pop_front_, const char * name_) : pop_front(pop_front_), name(name_) {}
String getName() const override { return name; }
bool isVariadic() const override { return false; }
size_t getNumberOfArguments() const override { return 1; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (arguments[0]->onlyNull())
return arguments[0];
const auto * array_type = typeid_cast<const DataTypeArray *>(arguments[0].get());
if (!array_type)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"First argument for function {} must be an array but it has type {}.",
getName(), arguments[0]->getName());
return arguments[0];
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
const auto & return_type = result_type;
if (return_type->onlyNull())
return return_type->createColumnConstWithDefaultValue(input_rows_count);
const auto & array_column = arguments[0].column;
std::unique_ptr<GatherUtils::IArraySource> source;
size_t size = array_column->size();
if (const auto * argument_column_array = typeid_cast<const ColumnArray *>(array_column.get()))
source = GatherUtils::createArraySource(*argument_column_array, false, size);
else
throw Exception(ErrorCodes::LOGICAL_ERROR, "First arguments for function {} must be array.", getName());
ColumnArray::MutablePtr sink;
if (pop_front)
sink = GatherUtils::sliceFromLeftConstantOffsetUnbounded(*source, 1);
else
sink = GatherUtils::sliceFromLeftConstantOffsetBounded(*source, 0, -1);
return sink;
}
bool useDefaultImplementationForConstants() const override { return true; }
bool useDefaultImplementationForNulls() const override { return false; }
private:
bool pop_front;
const char * name;
};
}
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