84 lines
3.1 KiB
C++
84 lines
3.1 KiB
C++
// 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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// This file is copied from
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// https://github.com/ClickHouse/ClickHouse/blob/master/src/Functions/Ifnull.h
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// and modified by Doris
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#include <stddef.h>
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#include <memory>
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#include "common/status.h"
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#include "vec/aggregate_functions/aggregate_function.h"
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#include "vec/columns/column.h"
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#include "vec/columns/column_nullable.h"
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#include "vec/core/block.h"
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#include "vec/core/column_numbers.h"
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#include "vec/core/column_with_type_and_name.h"
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#include "vec/core/types.h"
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#include "vec/data_types/data_type.h"
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#include "vec/data_types/data_type_nullable.h"
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#include "vec/functions/function.h"
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#include "vec/functions/simple_function_factory.h"
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namespace doris {
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class FunctionContext;
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} // namespace doris
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namespace doris::vectorized {
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class FunctionNonNullable : public IFunction {
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public:
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static constexpr auto name = "non_nullable";
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static FunctionPtr create() { return std::make_shared<FunctionNonNullable>(); }
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String get_name() const override { return name; }
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size_t get_number_of_arguments() const override { return 1; }
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DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {
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return remove_nullable(arguments[0]);
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}
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bool use_default_implementation_for_nulls() const override { return false; }
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// trans nullable column to non-nullable column. If argument is already non-nullable, raise error.
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Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
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size_t result, size_t input_rows_count) override {
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auto& data = block.get_by_position(arguments[0]);
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const ColumnNullable* column = check_and_get_column<ColumnNullable>(data.column);
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if (column == nullptr) // raise error if input is not nullable.
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{
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return Status::RuntimeError(
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"Try to use originally non-nullable column {} in nullable's non-nullable \
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convertion.",
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data.column->get_name(), get_name());
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} else { // column is ColumnNullable
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const ColumnPtr& type_ptr = column->get_nested_column_ptr();
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block.replace_by_position(result, type_ptr->clone_resized(type_ptr->size()));
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}
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return Status::OK();
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}
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};
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void register_function_non_nullable(SimpleFunctionFactory& factory) {
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factory.register_function<FunctionNonNullable>();
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}
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} // namespace doris::vectorized
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