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#pragma once
#include <DataTypes/DataTypeString.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnConst.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/IFunction.h>
#include <Functions/GatherUtils/GatherUtils.h>
#include <Functions/GatherUtils/Sources.h>
#include <Functions/GatherUtils/Sinks.h>
#include <Functions/GatherUtils/Slices.h>
#include <Functions/GatherUtils/Algorithms.h>
#include <IO/WriteHelpers.h>
#include <Interpreters/Context_fwd.h>
namespace DB
{
using namespace GatherUtils;
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
enum class SubstringDirection
{
Left,
Right
};
template <bool is_utf8, SubstringDirection direction>
class FunctionLeftRight : public IFunction
{
public:
static constexpr auto name = direction == SubstringDirection::Left
? (is_utf8 ? "leftUTF8" : "left")
: (is_utf8 ? "rightUTF8" : "right");
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionLeftRight>();
}
String getName() const override
{
return name;
}
bool isVariadic() const override { return false; }
size_t getNumberOfArguments() const override { return 2; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if ((is_utf8 && !isString(arguments[0])) || !isStringOrFixedString(arguments[0]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument of function {}", arguments[0]->getName(), getName());
if (!isNativeNumber(arguments[1]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of second argument of function {}",
arguments[1]->getName(), getName());
return std::make_shared<DataTypeString>();
}
template <typename Source>
ColumnPtr executeForSource(const ColumnPtr & column_length,
const ColumnConst * column_length_const,
Int64 length_value, Source && source,
size_t input_rows_count) const
{
auto col_res = ColumnString::create();
if constexpr (direction == SubstringDirection::Left)
{
if (column_length_const)
sliceFromLeftConstantOffsetBounded(source, StringSink(*col_res, input_rows_count), 0, length_value);
else
sliceFromLeftDynamicLength(source, StringSink(*col_res, input_rows_count), *column_length);
}
else
{
if (column_length_const)
sliceFromRightConstantOffsetUnbounded(source, StringSink(*col_res, input_rows_count), length_value);
else
sliceFromRightDynamicLength(source, StringSink(*col_res, input_rows_count), *column_length);
}
return col_res;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
ColumnPtr column_string = arguments[0].column;
ColumnPtr column_length = arguments[1].column;
const ColumnConst * column_length_const = checkAndGetColumn<ColumnConst>(column_length.get());
Int64 length_value = 0;
if (column_length_const)
length_value = column_length_const->getInt(0);
if constexpr (is_utf8)
{
if (const ColumnString * col = checkAndGetColumn<ColumnString>(column_string.get()))
return executeForSource(column_length, column_length_const,
length_value, UTF8StringSource(*col), input_rows_count);
else if (const ColumnConst * col_const = checkAndGetColumnConst<ColumnString>(column_string.get()))
return executeForSource(column_length, column_length_const,
length_value, ConstSource<UTF8StringSource>(*col_const), input_rows_count);
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}",
arguments[0].column->getName(), getName());
}
else
{
if (const ColumnString * col = checkAndGetColumn<ColumnString>(column_string.get()))
return executeForSource(column_length, column_length_const,
length_value, StringSource(*col), input_rows_count);
else if (const ColumnFixedString * col_fixed = checkAndGetColumn<ColumnFixedString>(column_string.get()))
return executeForSource(column_length, column_length_const,
length_value, FixedStringSource(*col_fixed), input_rows_count);
else if (const ColumnConst * col_const = checkAndGetColumnConst<ColumnString>(column_string.get()))
return executeForSource(column_length, column_length_const,
length_value, ConstSource<StringSource>(*col_const), input_rows_count);
else if (const ColumnConst * col_const_fixed = checkAndGetColumnConst<ColumnFixedString>(column_string.get()))
return executeForSource(column_length, column_length_const,
length_value, ConstSource<FixedStringSource>(*col_const_fixed), input_rows_count);
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}",
arguments[0].column->getName(), getName());
}
}
};
}
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