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

#pragma once

#include <DB/Parsers/IAST.h>


namespace DB
{


/** DROP запрос
  */
class ASTDropQuery : public IAST
{
public:
	bool detach{false};	/// Запрос DETACH, а не DROP.
	bool if_exists{false};
	String database;
	String table;

	ASTDropQuery() = default;
	ASTDropQuery(const StringRange range_) : IAST(range_) {}
	
	/** Получить текст, который идентифицирует этот элемент. */
	String getID() const override { return (detach ? "DetachQuery_" : "DropQuery_") + database + "_" + table; };

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

protected:
	void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
	{
		if (table.empty() && !database.empty())
		{
			settings.ostr << (settings.hilite ? hilite_keyword : "")
				<< (detach ? "DETACH DATABASE " : "DROP DATABASE ")
				<< (if_exists ? "IF EXISTS " : "")
				<< (settings.hilite ? hilite_none : "")
				<< backQuoteIfNeed(database);
			return;
		}

		settings.ostr << (settings.hilite ? hilite_keyword : "")
			<< (detach ? "DETACH TABLE " : "DROP TABLE ")
			<< (if_exists ? "IF EXISTS " : "") << (settings.hilite ? hilite_none : "")
			<< (!database.empty() ? backQuoteIfNeed(database) + "." : "") << backQuoteIfNeed(table);
	}
};

}