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