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

#pragma once

#include <mysqlxx/Manip.h>
#include <DB/Parsers/IAST.h>
#include <DB/Parsers/ASTQueryWithOutput.h>


namespace DB
{


/** Запрос SHOW TABLES или SHOW DATABASES
  */
class ASTShowTablesQuery : public ASTQueryWithOutput
{
public:
	bool databases{false};
	String from;
	String like;
	bool not_like{false};

	ASTShowTablesQuery() = default;
	ASTShowTablesQuery(const StringRange range_) : ASTQueryWithOutput(range_) {}

	/** Получить текст, который идентифицирует этот элемент. */
	String getID() const override { return "ShowTables"; };

	ASTPtr clone() const override
	{
		auto res = std::make_shared<ASTShowTablesQuery>(*this);
		res->children.clear();
		cloneOutputOptions(*res);
		return res;
	}

protected:
	void formatQueryImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
	{
		if (databases)
		{
			settings.ostr << (settings.hilite ? hilite_keyword : "") << "SHOW DATABASES" << (settings.hilite ? hilite_none : "");
		}
		else
		{
			settings.ostr << (settings.hilite ? hilite_keyword : "") << "SHOW TABLES" << (settings.hilite ? hilite_none : "");

			if (!from.empty())
				settings.ostr << (settings.hilite ? hilite_keyword : "") << " FROM " << (settings.hilite ? hilite_none : "")
					<< backQuoteIfNeed(from);

			if (!like.empty())
				settings.ostr << (settings.hilite ? hilite_keyword : "") << " LIKE " << (settings.hilite ? hilite_none : "")
					<< mysqlxx::quote << like;
		}
	}
};

}