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#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionFactory.h>
#include <Functions/IFunction.h>
#include <Interpreters/Context_fwd.h>
#include <Interpreters/castColumn.h>
#include <IO/WriteHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ILLEGAL_COLUMN;
}
class FunctionChar : public IFunction
{
public:
static constexpr auto name = "char";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionChar>(); }
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
bool isInjective(const ColumnsWithTypeAndName &) const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Number of arguments for function {} can't be {}, should be at least 1",
getName(), arguments.size());
for (const auto & arg : arguments)
{
WhichDataType which(arg);
if (!(which.isInt() || which.isUInt() || which.isFloat()))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument of function {}, must be Int, UInt or Float number",
arg->getName(), getName());
}
return std::make_shared<DataTypeString>();
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
auto col_str = ColumnString::create();
ColumnString::Chars & out_vec = col_str->getChars();
ColumnString::Offsets & out_offsets = col_str->getOffsets();
const auto size_per_row = arguments.size() + 1;
out_vec.resize(size_per_row * input_rows_count);
out_offsets.resize(input_rows_count);
for (size_t row = 0; row < input_rows_count; ++row)
{
out_offsets[row] = size_per_row + out_offsets[row - 1];
out_vec[row * size_per_row + size_per_row - 1] = '\0';
}
Columns columns_holder(arguments.size());
for (size_t idx = 0; idx < arguments.size(); ++idx)
{
//partial const column
columns_holder[idx] = arguments[idx].column->convertToFullColumnIfConst();
const IColumn * column = columns_holder[idx].get();
if (!(executeNumber<UInt8>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<UInt16>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<UInt32>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<UInt64>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<Int8>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<Int16>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<Int32>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<Int64>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<Float32>(*column, out_vec, idx, input_rows_count, size_per_row)
|| executeNumber<Float64>(*column, out_vec, idx, input_rows_count, size_per_row)))
{
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}",
arguments[idx].column->getName(), getName());
}
}
return col_str;
}
private:
template <typename T>
bool executeNumber(const IColumn & src_data, ColumnString::Chars & out_vec, const size_t & column_idx, const size_t & rows, const size_t & size_per_row) const
{
const ColumnVector<T> * src_data_concrete = checkAndGetColumn<ColumnVector<T>>(&src_data);
if (!src_data_concrete)
{
return false;
}
for (size_t row = 0; row < rows; ++row)
{
out_vec[row * size_per_row + column_idx] = static_cast<char>(src_data_concrete->getInt(row));
}
return true;
}
};
REGISTER_FUNCTION(Char)
{
factory.registerFunction<FunctionChar>({}, FunctionFactory::CaseInsensitive);
}
}
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