ClickHouse/dbms/src/Functions/arrayCumSum.cpp
alexey-milovidov 2c2d75cceb
Don't allow exceptions without code (#3645)
* Don't allow exceptions without code #3633

* Don't allow exceptions without code #3633
2018-11-23 00:19:58 +03:00

131 lines
4.4 KiB
C++

#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnsNumber.h>
#include <Functions/FunctionArrayMapped.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
struct ArrayCumSumImpl
{
static bool needBoolean() { return false; }
static bool needExpression() { return false; }
static bool needOneArray() { return false; }
static DataTypePtr getReturnType(const DataTypePtr & expression_return, const DataTypePtr & /*array_element*/)
{
WhichDataType which(expression_return);
if (which.isNativeUInt())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt64>());
if (which.isNativeInt())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt64>());
if (which.isFloat())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeFloat64>());
throw Exception("arrayCumSum cannot add values of type " + expression_return->getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
template <typename Element, typename Result>
static bool executeType(const ColumnPtr & mapped, const ColumnArray & array, ColumnPtr & res_ptr)
{
const ColumnVector<Element> * column = checkAndGetColumn<ColumnVector<Element>>(&*mapped);
if (!column)
{
const ColumnConst * column_const = checkAndGetColumnConst<ColumnVector<Element>>(&*mapped);
if (!column_const)
return false;
const Element x = column_const->template getValue<Element>();
const IColumn::Offsets & offsets = array.getOffsets();
auto res_nested = ColumnVector<Result>::create();
typename ColumnVector<Result>::Container & res_values = res_nested->getData();
res_values.resize(column_const->size());
size_t pos = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
// skip empty arrays
if (pos < offsets[i])
{
res_values[pos++] = x;
for (; pos < offsets[i]; ++pos)
{
res_values[pos] = res_values[pos - 1] + x;
}
}
}
res_ptr = ColumnArray::create(std::move(res_nested), array.getOffsetsPtr());
return true;
}
const IColumn::Offsets & offsets = array.getOffsets();
const typename ColumnVector<Element>::Container & data = column->getData();
auto res_nested = ColumnVector<Result>::create();
typename ColumnVector<Result>::Container & res_values = res_nested->getData();
res_values.resize(data.size());
size_t pos = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
// skip empty arrays
if (pos < offsets[i])
{
res_values[pos] = data[pos];
for (++pos; pos < offsets[i]; ++pos)
{
res_values[pos] = res_values[pos - 1] + data[pos];
}
}
}
res_ptr = ColumnArray::create(std::move(res_nested), array.getOffsetsPtr());
return true;
}
static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped)
{
ColumnPtr res;
if (executeType< UInt8 , UInt64>(mapped, array, res) ||
executeType< UInt16, UInt64>(mapped, array, res) ||
executeType< UInt32, UInt64>(mapped, array, res) ||
executeType< UInt64, UInt64>(mapped, array, res) ||
executeType< Int8 , Int64>(mapped, array, res) ||
executeType< Int16, Int64>(mapped, array, res) ||
executeType< Int32, Int64>(mapped, array, res) ||
executeType< Int64, Int64>(mapped, array, res) ||
executeType<Float32,Float64>(mapped, array, res) ||
executeType<Float64,Float64>(mapped, array, res))
return res;
else
throw Exception("Unexpected column for arrayCumSum: " + mapped->getName(), ErrorCodes::ILLEGAL_COLUMN);
}
};
struct NameArrayCumSum { static constexpr auto name = "arrayCumSum"; };
using FunctionArrayCumSum = FunctionArrayMapped<ArrayCumSumImpl, NameArrayCumSum>;
void registerFunctionArrayCumSum(FunctionFactory & factory)
{
factory.registerFunction<FunctionArrayCumSum>();
}
}