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#include <DataTypes/DataTypeString.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnConst.h>
#include <Functions/FunctionFactory.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>
namespace DB
{
using namespace GatherUtils;
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ZERO_ARRAY_OR_TUPLE_INDEX;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
/// If 'is_utf8' - measure offset and length in code points instead of bytes.
/// UTF8 variant is not available for FixedString arguments.
template <bool is_utf8>
class FunctionSubstring : public IFunction
{
public:
static constexpr auto name = is_utf8 ? "substringUTF8" : "substring";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionSubstring>();
}
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
size_t number_of_arguments = arguments.size();
if (number_of_arguments < 2 || number_of_arguments > 3)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Number of arguments for function {} doesn't match: "
"passed {}, should be 2 or 3", getName(), number_of_arguments);
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());
if (number_of_arguments == 3 && !isNativeNumber(arguments[2]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of second argument of function {}",
arguments[2]->getName(), getName());
return std::make_shared<DataTypeString>();
}
template <typename Source>
ColumnPtr executeForSource(const ColumnPtr & column_start, const ColumnPtr & column_length,
const ColumnConst * column_start_const, const ColumnConst * column_length_const,
Int64 start_value, Int64 length_value, Source && source,
size_t input_rows_count) const
{
auto col_res = ColumnString::create();
if (!column_length)
{
if (column_start_const)
{
if (start_value > 0)
sliceFromLeftConstantOffsetUnbounded(
source, StringSink(*col_res, input_rows_count), static_cast<size_t>(start_value - 1));
else if (start_value < 0)
sliceFromRightConstantOffsetUnbounded(
source, StringSink(*col_res, input_rows_count), -static_cast<size_t>(start_value));
else
throw Exception(ErrorCodes::ZERO_ARRAY_OR_TUPLE_INDEX, "Indices in strings are 1-based");
}
else
sliceDynamicOffsetUnbounded(source, StringSink(*col_res, input_rows_count), *column_start);
}
else
{
if (column_start_const && column_length_const)
{
if (start_value > 0)
sliceFromLeftConstantOffsetBounded(
source, StringSink(*col_res, input_rows_count), static_cast<size_t>(start_value - 1), length_value);
else if (start_value < 0)
sliceFromRightConstantOffsetBounded(
source, StringSink(*col_res, input_rows_count), -static_cast<size_t>(start_value), length_value);
else
throw Exception(ErrorCodes::ZERO_ARRAY_OR_TUPLE_INDEX, "Indices in strings are 1-based");
}
else
sliceDynamicOffsetBounded(source, StringSink(*col_res, input_rows_count), *column_start, *column_length);
}
return col_res;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
size_t number_of_arguments = arguments.size();
ColumnPtr column_string = arguments[0].column;
ColumnPtr column_start = arguments[1].column;
ColumnPtr column_length;
if (number_of_arguments == 3)
column_length = arguments[2].column;
const ColumnConst * column_start_const = checkAndGetColumn<ColumnConst>(column_start.get());
const ColumnConst * column_length_const = nullptr;
if (number_of_arguments == 3)
column_length_const = checkAndGetColumn<ColumnConst>(column_length.get());
Int64 start_value = 0;
Int64 length_value = 0;
if (column_start_const)
start_value = column_start_const->getInt(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_start, column_length, column_start_const, column_length_const, start_value,
length_value, UTF8StringSource(*col), input_rows_count);
else if (const ColumnConst * col_const = checkAndGetColumnConst<ColumnString>(column_string.get()))
return executeForSource(column_start, column_length, column_start_const, column_length_const, start_value,
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_start, column_length, column_start_const, column_length_const, start_value,
length_value, StringSource(*col), input_rows_count);
else if (const ColumnFixedString * col_fixed = checkAndGetColumn<ColumnFixedString>(column_string.get()))
return executeForSource(column_start, column_length, column_start_const, column_length_const, start_value,
length_value, FixedStringSource(*col_fixed), input_rows_count);
else if (const ColumnConst * col_const = checkAndGetColumnConst<ColumnString>(column_string.get()))
return executeForSource(column_start, column_length, column_start_const, column_length_const, start_value,
length_value, ConstSource<StringSource>(*col_const), input_rows_count);
else if (const ColumnConst * col_const_fixed = checkAndGetColumnConst<ColumnFixedString>(column_string.get()))
return executeForSource(column_start, column_length, column_start_const, column_length_const, start_value,
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());
}
}
};
}
REGISTER_FUNCTION(Substring)
{
factory.registerFunction<FunctionSubstring<false>>({}, FunctionFactory::CaseInsensitive);
factory.registerAlias("substr", "substring", FunctionFactory::CaseInsensitive);
factory.registerAlias("mid", "substring", FunctionFactory::CaseInsensitive); /// from MySQL dialect
factory.registerFunction<FunctionSubstring<true>>({}, FunctionFactory::CaseSensitive);
}
}
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