cpp-ch/local-engine/Parser/RelParsers/ExpandRelParser.h

/*
 * 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.
 */
#pragma once
#include <optional>
#include <Parser/ExpandField.h>
#include <Parser/RelParsers/RelParser.h>

namespace local_engine
{
class SerializedPlanParser;
class ExpandRelParser : public RelParser
{
public:
    explicit ExpandRelParser(ParserContextPtr parser_context_);
    ~ExpandRelParser() override = default;
    DB::QueryPlanPtr
    parse(DB::QueryPlanPtr query_plan, const substrait::Rel & rel, std::list<const substrait::Rel *> & rel_stack_) override;
    DB::QueryPlanPtr normalParse(DB::QueryPlanPtr query_plan, const substrait::Rel & rel, std::list<const substrait::Rel *> & rel_stack_);
    DB::QueryPlanPtr
    lazyAggregateExpandParse(DB::QueryPlanPtr query_plan, const substrait::Rel & rel, std::list<const substrait::Rel *> & rel_stack_);

    std::optional<const substrait::Rel *> getSingleInput(const substrait::Rel & rel) override { return &rel.expand().input(); }

private:
    bool isLazyAggregateExpand(const substrait::ExpandRel & expand_rel);
    ExpandField buildExpandField(const DB::Block & header, const substrait::ExpandRel & expand_rel);

    DB::AggregateDescriptions
    buildAggregations(const DB::Block & input_header, const ExpandField & expand_field, const substrait::AggregateRel & aggregate_rel);
};
}