[feature](bitwise function) bit_count/bit_shift_left/bit_shift_right implementation (#30046)
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61
be/src/vec/functions/function_bit_count.cpp
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61
be/src/vec/functions/function_bit_count.cpp
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// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include <bit>
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#include <bitset>
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#include <cstdint>
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#include <type_traits>
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#include "common/exception.h"
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#include "common/status.h"
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#include "gutil/integral_types.h"
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#include "util/radix_sort.h"
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#include "vec/core/types.h"
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#include "vec/functions/function_unary_arithmetic.h"
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#include "vec/functions/simple_function_factory.h"
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namespace doris::vectorized {
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struct NameBitCount {
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static constexpr auto name = "bit_count";
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};
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template <typename T>
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struct BitCountImpl {
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// No unsigned type in Java. So we need signed number as return type
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// Int8_MAX = 127
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using ResultType = std::conditional_t<sizeof(T) * 8 >= 128, Int16, Int8>;
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static inline ResultType apply(T a) {
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if constexpr (std::is_same_v<T, Int128> || std::is_same_v<T, Int64> ||
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std::is_same_v<T, Int32> || std::is_same_v<T, Int16> ||
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std::is_same_v<T, Int8>) {
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return std::popcount(static_cast<std::make_unsigned_t<T>>(a));
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} else {
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throw Exception(ErrorCode::INVALID_ARGUMENT,
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"bit_count only support using INTEGER as operator");
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}
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}
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};
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using FunctionBitCount = FunctionUnaryArithmetic<BitCountImpl, NameBitCount, false>;
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void register_function_bit_count(SimpleFunctionFactory& factory) {
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factory.register_function<FunctionBitCount>();
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}
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} // namespace doris::vectorized
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