// Copyright 2023 PingCAP, Inc.
//
// Licensed 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 <Common/typeid_cast.h>
#include <Parsers/ASTSelectQuery.h>
#include <Parsers/ASTSelectWithUnionQuery.h>


namespace DB
{

ASTPtr ASTSelectWithUnionQuery::clone() const
{
    auto res = std::make_shared<ASTSelectWithUnionQuery>(*this);
    res->children.clear();

    res->list_of_selects = list_of_selects->clone();
    res->children.push_back(res->list_of_selects);

    cloneOutputOptions(*res);
    return res;
}


void ASTSelectWithUnionQuery::formatQueryImpl(
    const FormatSettings & settings,
    FormatState & state,
    FormatStateStacked frame) const
{
    std::string indent_str = settings.one_line ? "" : std::string(4 * frame.indent, ' ');

    for (ASTs::const_iterator it = list_of_selects->children.begin(); it != list_of_selects->children.end(); ++it)
    {
        if (it != list_of_selects->children.begin())
            settings.ostr << settings.nl_or_ws << indent_str << (settings.hilite ? hilite_keyword : "") << "UNION ALL"
                          << (settings.hilite ? hilite_keyword : "") << settings.nl_or_ws;

        (*it)->formatImpl(settings, state, frame);
    }
}


void ASTSelectWithUnionQuery::setDatabaseIfNeeded(const String & database_name)
{
    for (auto & child : list_of_selects->children)
        typeid_cast<ASTSelectQuery &>(*child).setDatabaseIfNeeded(database_name);
}

} // namespace DB