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271 lines (210 loc) · 10.3 KB
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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeArray.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Common/typeid_cast.h>
#include <Common/assert_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
class FunctionArrayReverse final : public IFunction
{
public:
static constexpr auto name = "arrayReverse";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayReverse>(); }
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isInjective(const ColumnsWithTypeAndName &) const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[0].get());
if (!array_type)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Argument for function {} must be array.", getName());
return arguments[0];
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t) const override;
private:
template <typename T>
static bool executeNumber(const IColumn & src_data, const ColumnArray::Offsets & src_offsets, IColumn & res_data);
static bool executeFixedString(const IColumn & src_data, const ColumnArray::Offsets & src_offsets, IColumn & res_data);
static bool executeString(const IColumn & src_data, const ColumnArray::Offsets & src_array_offsets, IColumn & res_data);
static bool executeGeneric(const IColumn & src_data, const ColumnArray::Offsets & src_array_offsets, IColumn & res_data);
};
ColumnPtr FunctionArrayReverse::executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t) const
{
const ColumnArray * array = checkAndGetColumn<ColumnArray>(arguments[0].column.get());
if (!array)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}",
arguments[0].column->getName(), getName());
auto res_ptr = array->cloneEmpty();
ColumnArray & res = assert_cast<ColumnArray &>(*res_ptr);
res.getOffsetsPtr() = array->getOffsetsPtr();
const IColumn & src_data = array->getData();
const ColumnArray::Offsets & offsets = array->getOffsets();
IColumn & res_data = res.getData();
const ColumnNullable * src_nullable_col = typeid_cast<const ColumnNullable *>(&src_data);
ColumnNullable * res_nullable_col = typeid_cast<ColumnNullable *>(&res_data);
const IColumn * src_inner_col = src_nullable_col ? &src_nullable_col->getNestedColumn() : &src_data;
IColumn * res_inner_col = res_nullable_col ? &res_nullable_col->getNestedColumn() : &res_data;
false // NOLINT
|| executeNumber<UInt8>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<UInt16>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<UInt32>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<UInt64>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<Int8>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<Int16>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<Int32>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<Int64>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<Float32>(*src_inner_col, offsets, *res_inner_col)
|| executeNumber<Float64>(*src_inner_col, offsets, *res_inner_col)
|| executeString(*src_inner_col, offsets, *res_inner_col)
|| executeFixedString(*src_inner_col, offsets, *res_inner_col)
|| executeGeneric(*src_inner_col, offsets, *res_inner_col);
chassert(bool(src_nullable_col) == bool(res_nullable_col));
if (src_nullable_col)
if (!executeNumber<UInt8>(src_nullable_col->getNullMapColumn(), offsets, res_nullable_col->getNullMapColumn()))
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of null map of the first argument of function {}",
src_nullable_col->getNullMapColumn().getName(), getName());
return res_ptr;
}
bool FunctionArrayReverse::executeGeneric(const IColumn & src_data, const ColumnArray::Offsets & src_array_offsets, IColumn & res_data)
{
size_t size = src_array_offsets.size();
res_data.reserve(src_data.size());
ColumnArray::Offset src_prev_offset = 0;
for (size_t i = 0; i < size; ++i)
{
ssize_t src_index = src_array_offsets[i] - 1;
while (src_index >= static_cast<ssize_t>(src_prev_offset))
{
res_data.insertFrom(src_data, src_index);
--src_index;
}
src_prev_offset = src_array_offsets[i];
}
return true;
}
template <typename T>
bool FunctionArrayReverse::executeNumber(const IColumn & src_data, const ColumnArray::Offsets & src_offsets, IColumn & res_data)
{
if (const ColumnVector<T> * src_data_concrete = checkAndGetColumn<ColumnVector<T>>(&src_data))
{
const PaddedPODArray<T> & src_vec = src_data_concrete->getData();
PaddedPODArray<T> & res_vec = typeid_cast<ColumnVector<T> &>(res_data).getData();
res_vec.resize(src_data.size());
size_t size = src_offsets.size();
ColumnArray::Offset src_prev_offset = 0;
for (size_t i = 0; i < size; ++i)
{
const auto * src = &src_vec[src_prev_offset];
const auto * src_end = &src_vec[src_offsets[i]];
if (src == src_end)
continue;
auto * dst = &res_vec[src_offsets[i] - 1];
while (src < src_end)
{
*dst = *src;
++src;
--dst;
}
src_prev_offset = src_offsets[i];
}
return true;
}
return false;
}
bool FunctionArrayReverse::executeFixedString(const IColumn & src_data, const ColumnArray::Offsets & src_offsets, IColumn & res_data)
{
if (const ColumnFixedString * src_data_concrete = checkAndGetColumn<ColumnFixedString>(&src_data))
{
const size_t n = src_data_concrete->getN();
const ColumnFixedString::Chars & src_data_chars = src_data_concrete->getChars();
ColumnFixedString::Chars & res_chars = typeid_cast<ColumnFixedString &>(res_data).getChars();
size_t size = src_offsets.size();
res_chars.resize(src_data_chars.size());
ColumnArray::Offset src_prev_offset = 0;
for (size_t i = 0; i < size; ++i)
{
const UInt8 * src = &src_data_chars[src_prev_offset * n];
const UInt8 * src_end = &src_data_chars[src_offsets[i] * n];
if (src == src_end)
continue;
UInt8 * dst = &res_chars[src_offsets[i] * n - n];
while (src < src_end)
{
/// NOTE: memcpySmallAllowReadWriteOverflow15 doesn't work correctly here.
memcpy(dst, src, n);
src += n;
dst -= n;
}
src_prev_offset = src_offsets[i];
}
return true;
}
return false;
}
bool FunctionArrayReverse::executeString(const IColumn & src_data, const ColumnArray::Offsets & src_array_offsets, IColumn & res_data)
{
if (const ColumnString * src_data_concrete = checkAndGetColumn<ColumnString>(&src_data))
{
const ColumnString::Offsets & src_string_offsets = src_data_concrete->getOffsets();
ColumnString::Offsets & res_string_offsets = typeid_cast<ColumnString &>(res_data).getOffsets();
const ColumnString::Chars & src_data_chars = src_data_concrete->getChars();
ColumnString::Chars & res_chars = typeid_cast<ColumnString &>(res_data).getChars();
size_t size = src_array_offsets.size();
res_string_offsets.resize(src_string_offsets.size());
res_chars.resize(src_data_chars.size());
ColumnArray::Offset src_array_prev_offset = 0;
ColumnString::Offset res_string_prev_offset = 0;
for (size_t i = 0; i < size; ++i)
{
if (src_array_offsets[i] != src_array_prev_offset)
{
size_t array_size = src_array_offsets[i] - src_array_prev_offset;
for (size_t j = 0; j < array_size; ++j)
{
size_t j_reversed = array_size - j - 1;
auto src_pos = src_string_offsets[src_array_prev_offset + j_reversed - 1];
size_t string_size = src_string_offsets[src_array_prev_offset + j_reversed] - src_pos;
memcpySmallAllowReadWriteOverflow15(&res_chars[res_string_prev_offset], &src_data_chars[src_pos], string_size);
res_string_prev_offset += string_size;
res_string_offsets[src_array_prev_offset + j] = res_string_prev_offset;
}
}
src_array_prev_offset = src_array_offsets[i];
}
return true;
}
return false;
}
REGISTER_FUNCTION(ArrayReverse)
{
FunctionDocumentation::Description description = R"(
Reverses the order of elements of a given array.
<Note>
Function `reverse(arr)` performs the same functionality but works on other data-types
in addition to Arrays.
</Note>
)";
FunctionDocumentation::Syntax syntax = "arrayReverse(arr)";
FunctionDocumentation::Arguments arguments = {
{"arr", "The array to reverse.", {"Array(T)"}}
};
FunctionDocumentation::ReturnedValue returned_value = {"Returns an array of the same size as the original array containing the elements in reverse order", {"Array(T)"}};
FunctionDocumentation::Examples examples = {{"Usage example", "SELECT arrayReverse([1, 2, 3])", "[3,2,1]"}};
FunctionDocumentation::IntroducedIn introduced_in = {1, 1};
FunctionDocumentation::Category category = FunctionDocumentation::Category::Array;
FunctionDocumentation documentation = {description, syntax, arguments, {}, returned_value, examples, introduced_in, category};
factory.registerFunction<FunctionArrayReverse>(documentation);
}
}