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#pragma once
#include <Functions/IFunction.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeFixedString.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnNullable.h>
#include <IO/WriteHelpers.h>
#include <Interpreters/Context_fwd.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int TOO_LARGE_STRING_SIZE;
extern const int NOT_IMPLEMENTED;
}
enum class ConvertToFixedStringExceptionMode
{
Throw,
Null
};
/** Conversion to fixed string is implemented only for strings.
*/
class FunctionToFixedString : public IFunction
{
public:
static constexpr auto name = "toFixedString";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToFixedString>(); }
static FunctionPtr create() { return std::make_shared<FunctionToFixedString>(); }
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 2; }
bool isInjective(const ColumnsWithTypeAndName &) const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (!isUnsignedInteger(arguments[1].type))
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Second argument for function {} must be unsigned integer", getName());
if (!arguments[1].column)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Second argument for function {} must be constant", getName());
if (!isStringOrFixedString(arguments[0].type))
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "{} is only implemented for types String and FixedString", getName());
const size_t n = arguments[1].column->getUInt(0);
return std::make_shared<DataTypeFixedString>(n);
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const auto n = arguments[1].column->getUInt(0);
return executeForN<ConvertToFixedStringExceptionMode::Throw>(arguments, n);
}
template<ConvertToFixedStringExceptionMode exception_mode>
static ColumnPtr executeForN(const ColumnsWithTypeAndName & arguments, const size_t n)
{
const auto & column = arguments[0].column;
ColumnUInt8::MutablePtr col_null_map_to;
ColumnUInt8::Container * vec_null_map_to [[maybe_unused]] = nullptr;
if constexpr (exception_mode == ConvertToFixedStringExceptionMode::Null)
{
col_null_map_to = ColumnUInt8::create(column->size(), false);
vec_null_map_to = &col_null_map_to->getData();
}
if (const auto * column_string = checkAndGetColumn<ColumnString>(column.get()))
{
auto column_fixed = ColumnFixedString::create(n);
auto & out_chars = column_fixed->getChars();
const auto & in_chars = column_string->getChars();
const auto & in_offsets = column_string->getOffsets();
out_chars.resize_fill(in_offsets.size() * n);
for (size_t i = 0; i < in_offsets.size(); ++i)
{
const size_t off = i ? in_offsets[i - 1] : 0;
const size_t len = in_offsets[i] - off - 1;
if (len > n)
{
if constexpr (exception_mode == ConvertToFixedStringExceptionMode::Throw)
{
throw Exception(ErrorCodes::TOO_LARGE_STRING_SIZE, "String too long for type FixedString({})", toString(n));
}
else
{
(*vec_null_map_to)[i] = true;
continue;
}
}
memcpy(&out_chars[i * n], &in_chars[off], len);
}
if constexpr (exception_mode == ConvertToFixedStringExceptionMode::Null)
return ColumnNullable::create(std::move(column_fixed), std::move(col_null_map_to));
else
return column_fixed;
}
else if (const auto * column_fixed_string = checkAndGetColumn<ColumnFixedString>(column.get()))
{
const auto src_n = column_fixed_string->getN();
if (src_n > n)
{
if constexpr (exception_mode == ConvertToFixedStringExceptionMode::Throw)
{
throw Exception(ErrorCodes::TOO_LARGE_STRING_SIZE, "String too long for type FixedString({})", toString(n));
}
else
{
auto column_fixed = ColumnFixedString::create(n);
std::fill(vec_null_map_to->begin(), vec_null_map_to->end(), true);
return ColumnNullable::create(column_fixed->cloneResized(column->size()), std::move(col_null_map_to));
}
}
auto column_fixed = ColumnFixedString::create(n);
auto & out_chars = column_fixed->getChars();
const auto & in_chars = column_fixed_string->getChars();
const auto size = column_fixed_string->size();
out_chars.resize_fill(size * n);
for (size_t i = 0; i < size; ++i)
memcpy(&out_chars[i * n], &in_chars[i * src_n], src_n);
return column_fixed;
}
else
{
if constexpr (exception_mode == ConvertToFixedStringExceptionMode::Throw)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unexpected column: {}", column->getName());
else
{
auto column_fixed = ColumnFixedString::create(n);
std::fill(vec_null_map_to->begin(), vec_null_map_to->end(), true);
return ColumnNullable::create(column_fixed->cloneResized(column->size()), std::move(col_null_map_to));
}
}
}
};
}
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