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#pragma once
#include <Functions/IFunction.h>
#include <Functions/GatherUtils/GatherUtils.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/getLeastSupertype.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnConst.h>
#include <Interpreters/castColumn.h>
#include <Common/typeid_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
class FunctionArrayPush : public IFunction
{
public:
FunctionArrayPush(bool push_front_, const char * name_)
: push_front(push_front_), name(name_) {}
String getName() const override { return name; }
bool isVariadic() const override { return false; }
size_t getNumberOfArguments() const override { return 2; }
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());
auto nested_type = array_type->getNestedType();
DataTypes types = {nested_type, arguments[1]};
return std::make_shared<DataTypeArray>(getLeastSupertype(types));
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & return_type, size_t input_rows_count) const override
{
if (return_type->onlyNull())
return return_type->createColumnConstWithDefaultValue(input_rows_count);
auto result_column = return_type->createColumn();
auto array_column = arguments[0].column;
auto appended_column = arguments[1].column;
if (!arguments[0].type->equals(*return_type))
array_column = castColumn(arguments[0], return_type);
const DataTypePtr & return_nested_type = typeid_cast<const DataTypeArray &>(*return_type).getNestedType();
if (!arguments[1].type->equals(*return_nested_type))
appended_column = castColumn(arguments[1], return_nested_type);
std::unique_ptr<GatherUtils::IArraySource> array_source;
std::unique_ptr<GatherUtils::IValueSource> value_source;
size_t size = array_column->size();
bool is_const = false;
if (const auto * const_array_column = typeid_cast<const ColumnConst *>(array_column.get()))
{
is_const = true;
array_column = const_array_column->getDataColumnPtr();
}
if (const auto * argument_column_array = typeid_cast<const ColumnArray *>(array_column.get()))
array_source = GatherUtils::createArraySource(*argument_column_array, is_const, size);
else
throw Exception(ErrorCodes::LOGICAL_ERROR, "First arguments for function {} must be array.", getName());
bool is_appended_const = false;
if (const auto * const_appended_column = typeid_cast<const ColumnConst *>(appended_column.get()))
{
is_appended_const = true;
appended_column = const_appended_column->getDataColumnPtr();
}
value_source = GatherUtils::createValueSource(*appended_column, is_appended_const, size);
auto sink = GatherUtils::createArraySink(typeid_cast<ColumnArray &>(*result_column), size);
GatherUtils::push(*array_source, *value_source, *sink, push_front);
return result_column;
}
bool useDefaultImplementationForConstants() const override { return true; }
bool useDefaultImplementationForNulls() const override { return false; }
private:
bool push_front;
const char * name;
};
}
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