ClickHouse/dbms/include/DB/Parsers/ASTRenameQuery.h

#pragma once

#include <DB/Parsers/IAST.h>


namespace DB
{


/** RENAME запрос
  */
class ASTRenameQuery : public IAST
{
public:
	struct Table
	{
		String database;
		String table;
	};

	struct Element
	{
		Table from;
		Table to;
	};

	using Elements = std::vector<Element>;
	Elements elements;

	ASTRenameQuery() = default;
	ASTRenameQuery(const StringRange range_) : IAST(range_) {}
	
	/** Получить текст, который идентифицирует этот элемент. */
	String getID() const override { return "Rename"; };

	ASTPtr clone() const override { return std::make_shared<ASTRenameQuery>(*this); }

protected:
	void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
	{
		settings.ostr << (settings.hilite ? hilite_keyword : "") << "RENAME TABLE " << (settings.hilite ? hilite_none : "");

		for (ASTRenameQuery::Elements::const_iterator it = elements.begin(); it != elements.end(); ++it)
		{
			if (it != elements.begin())
				settings.ostr << ", ";

			settings.ostr << (!it->from.database.empty() ? backQuoteIfNeed(it->from.database) + "." : "") << backQuoteIfNeed(it->from.table)
				<< (settings.hilite ? hilite_keyword : "") << " TO " << (settings.hilite ? hilite_none : "")
				<< (!it->to.database.empty() ? backQuoteIfNeed(it->to.database) + "." : "") << backQuoteIfNeed(it->to.table);
		}
	}
};

}