mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
#pragma once
|
|
|
|
#include <Columns/ColumnArray.h>
|
|
#include <Columns/ColumnConst.h>
|
|
#include <Columns/ColumnString.h>
|
|
#include <Columns/ColumnFixedString.h>
|
|
#include <Columns/ColumnVector.h>
|
|
#include <DataTypes/DataTypeArray.h>
|
|
#include <DataTypes/DataTypeString.h>
|
|
#include <DataTypes/DataTypesNumber.h>
|
|
#include <Functions/FunctionHelpers.h>
|
|
#include <Functions/IFunctionImpl.h>
|
|
#include <IO/WriteHelpers.h>
|
|
#include <Interpreters/Context.h>
|
|
#include <common/StringRef.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
/** Applies regexp re2 and extracts:
|
|
* - the first subpattern, if the regexp has a subpattern;
|
|
* - the zero subpattern (the match part, otherwise);
|
|
* - if not match - an empty string.
|
|
* extract(haystack, pattern)
|
|
*/
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
|
|
extern const int ILLEGAL_COLUMN;
|
|
}
|
|
|
|
|
|
template <typename Impl, typename Name>
|
|
class FunctionsStringSearchToString : public IFunction
|
|
{
|
|
public:
|
|
static constexpr auto name = Name::name;
|
|
static FunctionPtr create(const Context &) { return std::make_shared<FunctionsStringSearchToString>(); }
|
|
|
|
String getName() const override { return name; }
|
|
|
|
size_t getNumberOfArguments() const override { return 2; }
|
|
|
|
bool useDefaultImplementationForConstants() const override { return true; }
|
|
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
|
|
|
|
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
|
|
{
|
|
if (!isString(arguments[0]))
|
|
throw Exception(
|
|
"Illegal type " + arguments[0]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
|
|
|
if (!isString(arguments[1]))
|
|
throw Exception(
|
|
"Illegal type " + arguments[1]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
|
|
|
return std::make_shared<DataTypeString>();
|
|
}
|
|
|
|
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
|
|
{
|
|
const ColumnPtr column = arguments[0].column;
|
|
const ColumnPtr column_needle = arguments[1].column;
|
|
|
|
const ColumnConst * col_needle = typeid_cast<const ColumnConst *>(&*column_needle);
|
|
if (!col_needle)
|
|
throw Exception("Second argument of function " + getName() + " must be constant string", ErrorCodes::ILLEGAL_COLUMN);
|
|
|
|
if (const ColumnString * col = checkAndGetColumn<ColumnString>(column.get()))
|
|
{
|
|
auto col_res = ColumnString::create();
|
|
|
|
ColumnString::Chars & vec_res = col_res->getChars();
|
|
ColumnString::Offsets & offsets_res = col_res->getOffsets();
|
|
Impl::vector(col->getChars(), col->getOffsets(), col_needle->getValue<String>(), vec_res, offsets_res);
|
|
|
|
return col_res;
|
|
}
|
|
else
|
|
throw Exception(
|
|
"Illegal column " + arguments[0].column->getName() + " of argument of function " + getName(),
|
|
ErrorCodes::ILLEGAL_COLUMN);
|
|
}
|
|
};
|
|
|
|
}
|