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#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeFixedString.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int LOGICAL_ERROR;
extern const int ILLEGAL_COLUMN;
}
class FunctionToStringCutToZero : public IFunction
{
public:
static constexpr auto name = "toStringCutToZero";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToStringCutToZero>(); }
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!isStringOrFixedString(arguments[0]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument of function {}",
arguments[0]->getName(), getName());
return std::make_shared<DataTypeString>();
}
bool useDefaultImplementationForConstants() const override { return true; }
static bool tryExecuteString(const IColumn * col, ColumnPtr & col_res)
{
const ColumnString * col_str_in = checkAndGetColumn<ColumnString>(col);
if (col_str_in)
{
auto col_str = ColumnString::create();
ColumnString::Chars & out_vec = col_str->getChars();
ColumnString::Offsets & out_offsets = col_str->getOffsets();
const ColumnString::Chars & in_vec = col_str_in->getChars();
const ColumnString::Offsets & in_offsets = col_str_in->getOffsets();
size_t size = in_offsets.size();
out_offsets.resize(size);
out_vec.resize(in_vec.size());
char * begin = reinterpret_cast<char *>(out_vec.data());
char * pos = begin;
ColumnString::Offset current_in_offset = 0;
for (size_t i = 0; i < size; ++i)
{
const char * pos_in = reinterpret_cast<const char *>(&in_vec[current_in_offset]);
size_t current_size = strlen(pos_in);
memcpySmallAllowReadWriteOverflow15(pos, pos_in, current_size);
pos += current_size;
*pos = '\0';
++pos;
out_offsets[i] = pos - begin;
current_in_offset = in_offsets[i];
}
out_vec.resize(pos - begin);
if (!out_offsets.empty() && out_offsets.back() != out_vec.size())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Column size mismatch (internal logical error)");
col_res = std::move(col_str);
return true;
}
else
{
return false;
}
}
static bool tryExecuteFixedString(const IColumn * col, ColumnPtr & col_res)
{
const ColumnFixedString * col_fstr_in = checkAndGetColumn<ColumnFixedString>(col);
if (col_fstr_in)
{
auto col_str = ColumnString::create();
ColumnString::Chars & out_vec = col_str->getChars();
ColumnString::Offsets & out_offsets = col_str->getOffsets();
const ColumnString::Chars & in_vec = col_fstr_in->getChars();
size_t size = col_fstr_in->size();
out_offsets.resize(size);
out_vec.resize(in_vec.size() + size);
char * begin = reinterpret_cast<char *>(out_vec.data());
char * pos = begin;
const char * pos_in = reinterpret_cast<const char *>(in_vec.data());
size_t n = col_fstr_in->getN();
for (size_t i = 0; i < size; ++i)
{
size_t current_size = strnlen(pos_in, n);
memcpySmallAllowReadWriteOverflow15(pos, pos_in, current_size);
pos += current_size;
*pos = '\0';
out_offsets[i] = ++pos - begin;
pos_in += n;
}
out_vec.resize(pos - begin);
if (!out_offsets.empty() && out_offsets.back() != out_vec.size())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Column size mismatch (internal logical error)");
col_res = std::move(col_str);
return true;
}
else
{
return false;
}
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const IColumn * column = arguments[0].column.get();
ColumnPtr res_column;
if (tryExecuteFixedString(column, res_column) || tryExecuteString(column, res_column))
return res_column;
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of argument of function {}",
arguments[0].column->getName(), getName());
}
};
REGISTER_FUNCTION(ToStringCutToZero)
{
factory.registerFunction<FunctionToStringCutToZero>();
}
}
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