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136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
#include "config_core.h"
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#if USE_NLP
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#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/IFunction.h>
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#include <Interpreters/Context.h>
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#include <libstemmer.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ILLEGAL_COLUMN;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int SUPPORT_IS_DISABLED;
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}
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namespace
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{
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struct StemImpl
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{
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static void vector(
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const ColumnString::Chars & data,
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const ColumnString::Offsets & offsets,
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ColumnString::Chars & res_data,
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ColumnString::Offsets & res_offsets,
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const String & language)
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{
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sb_stemmer * stemmer = sb_stemmer_new(language.data(), "UTF_8");
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if (stemmer == nullptr)
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{
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throw Exception(
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"Language " + language + " is not supported for function stem",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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res_data.resize(data.size());
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res_offsets.assign(offsets);
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UInt64 data_size = 0;
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for (UInt64 i = 0; i < offsets.size(); ++i)
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{
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/// Note that accessing -1th element is valid for PaddedPODArray.
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size_t original_size = offsets[i] - offsets[i - 1];
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const sb_symbol * result = sb_stemmer_stem(stemmer,
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reinterpret_cast<const uint8_t *>(data.data() + offsets[i - 1]),
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original_size - 1);
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size_t new_size = sb_stemmer_length(stemmer) + 1;
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memcpy(res_data.data() + data_size, result, new_size);
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data_size += new_size;
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res_offsets[i] = data_size;
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}
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res_data.resize(data_size);
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sb_stemmer_delete(stemmer);
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}
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};
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class FunctionStem : public IFunction
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{
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public:
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static constexpr auto name = "stem";
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static FunctionPtr create(ContextPtr context)
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{
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if (!context->getSettingsRef().allow_experimental_nlp_functions)
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throw Exception(ErrorCodes::SUPPORT_IS_DISABLED, "Natural language processing function '{}' is experimental. Set `allow_experimental_nlp_functions` setting to enable it", name);
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return std::make_shared<FunctionStem>();
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}
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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 isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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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 arguments[1];
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0}; }
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t) const override
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{
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const auto & langcolumn = arguments[0].column;
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const auto & strcolumn = arguments[1].column;
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const ColumnConst * lang_col = checkAndGetColumn<ColumnConst>(langcolumn.get());
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const ColumnString * words_col = checkAndGetColumn<ColumnString>(strcolumn.get());
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if (!lang_col)
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throw Exception(
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"Illegal column " + arguments[0].column->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
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if (!words_col)
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throw Exception(
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"Illegal column " + arguments[1].column->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
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String language = lang_col->getValue<String>();
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auto col_res = ColumnString::create();
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StemImpl::vector(words_col->getChars(), words_col->getOffsets(), col_res->getChars(), col_res->getOffsets(), language);
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return col_res;
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}
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};
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}
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void registerFunctionStem(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionStem>(FunctionFactory::CaseInsensitive);
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}
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}
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#endif
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