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105 lines
4.5 KiB
C++
105 lines
4.5 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/IFunction.h>
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#include <IO/WriteHelpers.h>
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#include <Interpreters/Context.h>
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namespace DB
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{
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/**
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* multiSearchAllPositions(haystack, [pattern_1, pattern_2, ..., pattern_n]) -- find first occurrences (positions) of all the const patterns inside haystack
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* multiSearchAllPositionsUTF8(haystack, [pattern_1, pattern_2, ..., pattern_n])
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* multiSearchAllPositionsCaseInsensitive(haystack, [pattern_1, pattern_2, ..., pattern_n])
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* multiSearchAllPositionsCaseInsensitiveUTF8(haystack, [pattern_1, pattern_2, ..., pattern_n])
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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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}
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template <typename Impl>
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class FunctionsMultiStringPosition : public IFunction
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{
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionsMultiStringPosition>(); }
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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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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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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument of function {}", arguments[0]->getName(), getName());
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const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[1].get());
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if (!array_type || !checkAndGetDataType<DataTypeString>(array_type->getNestedType().get()))
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument of function {}", arguments[1]->getName(), getName());
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt64>());
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
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{
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const ColumnPtr & haystack_ptr = arguments[0].column;
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const ColumnPtr & needles_ptr = arguments[1].column;
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const ColumnString * col_haystack_vector = checkAndGetColumn<ColumnString>(&*haystack_ptr);
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const ColumnConst * col_haystack_const = checkAndGetColumnConst<ColumnString>(&*haystack_ptr);
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assert(static_cast<bool>(col_haystack_vector) ^ static_cast<bool>(col_haystack_const));
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const ColumnArray * col_needles_vector = checkAndGetColumn<ColumnArray>(needles_ptr.get());
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const ColumnConst * col_needles_const = checkAndGetColumnConst<ColumnArray>(needles_ptr.get());
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assert(static_cast<bool>(col_needles_vector) ^ static_cast<bool>(col_needles_const));
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if (col_haystack_const && col_needles_vector)
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Function '{}' doesn't support search with non-constant needles in constant haystack", name);
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using ResultType = typename Impl::ResultType;
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auto col_res = ColumnVector<ResultType>::create();
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auto col_offsets = ColumnArray::ColumnOffsets::create();
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auto & vec_res = col_res->getData();
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auto & offsets_res = col_offsets->getData();
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/// the implementations are responsible for resizing the output column
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if (col_needles_const)
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Impl::vectorConstant(
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col_haystack_vector->getChars(), col_haystack_vector->getOffsets(),
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col_needles_const->getValue<Array>(),
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vec_res, offsets_res);
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else
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Impl::vectorVector(
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col_haystack_vector->getChars(), col_haystack_vector->getOffsets(),
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col_needles_vector->getData(), col_needles_vector->getOffsets(),
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vec_res, offsets_res);
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// the combination of const haystack + const needle is not implemented because
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// useDefaultImplementationForConstants() == true makes upper layers convert both to
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// non-const columns
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return ColumnArray::create(std::move(col_res), std::move(col_offsets));
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}
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};
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}
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