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Copy pathfunction_array_except.cpp
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86 lines (76 loc) · 2.73 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#include "core/assert_cast.h"
#include "core/column/column_const.h"
#include "core/data_type/data_type.h"
#include "core/data_type/data_type_nullable.h"
#include "core/string_ref.h"
#include "exprs/function/array/function_array_binary.h"
#include "exprs/function/array/function_array_set.h"
#include "exprs/function/simple_function_factory.h"
namespace doris {
struct NameArrayExcept {
static constexpr auto name = "array_except";
};
template <typename Set, typename Element>
struct ExceptAction {
// True if set has null element
bool null_flag = false;
// True if result_set has null element
bool result_null_flag = false;
// True if it should execute the left array first.
static constexpr auto execute_left_column_first = false;
// Handle Null element.
// Return true means this null element should put into result column.
template <bool is_left>
bool apply_null() {
if constexpr (is_left) {
if (!null_flag) {
null_flag = true;
return true;
}
} else {
if (!null_flag) {
null_flag = true;
}
}
return false;
}
// Handle Non-Null element.
// Return ture means this Non-Null element should put into result column.
template <bool is_left>
bool apply(Set& set, Set& result_set, const Element& elem) {
if constexpr (is_left) {
if (!set.contains(elem)) {
set.insert(elem);
return true;
}
} else {
if (!set.contains(elem)) {
set.insert(elem);
}
}
return false;
}
void reset() { null_flag = false; }
};
using FunctionArrayExcept =
FunctionArrayBinary<ArraySetImpl<SetOperation::EXCEPT>, NameArrayExcept>;
void register_function_array_except(SimpleFunctionFactory& factory) {
factory.register_function<FunctionArrayExcept>();
}
} // namespace doris