ClickHouse/dbms/src/Parsers/ParserOptimizeQuery.cpp

#include <DB/Parsers/ASTIdentifier.h>
#include <DB/Parsers/ASTOptimizeQuery.h>

#include <DB/Parsers/CommonParsers.h>
#include <DB/Parsers/ParserOptimizeQuery.h>
#include <DB/Parsers/ASTLiteral.h>


namespace DB
{


bool ParserOptimizeQuery::parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_parsed_pos, Expected & expected)
{
	Pos begin = pos;

	ParserWhiteSpaceOrComments ws;
	ParserString s_optimize("OPTIMIZE", true, true);
	ParserString s_table("TABLE", true, true);
	ParserString s_partition("PARTITION", true, true);
	ParserString s_final("FINAL", true, true);
	ParserString s_dot(".");
	ParserIdentifier name_p;
	ParserLiteral partition_p;

	ASTPtr database;
	ASTPtr table;
	ASTPtr partition;
	bool final = false;

	ws.ignore(pos, end);

	if (!s_optimize.ignore(pos, end, max_parsed_pos, expected))
		return false;

	ws.ignore(pos, end);

	if (!s_table.ignore(pos, end, max_parsed_pos, expected))
		return false;

	ws.ignore(pos, end);

	if (!name_p.parse(pos, end, table, max_parsed_pos, expected))
		return false;

	ws.ignore(pos, end);

	if (s_dot.ignore(pos, end, max_parsed_pos, expected))
	{
		database = table;
		if (!name_p.parse(pos, end, table, max_parsed_pos, expected))
			return false;

		ws.ignore(pos, end);
	}

	ws.ignore(pos, end);

	if (s_partition.ignore(pos, end, max_parsed_pos, expected))
	{
		ws.ignore(pos, end);

		if (!partition_p.parse(pos, end, partition, max_parsed_pos, expected))
			return false;
	}

	ws.ignore(pos, end);

	if (s_final.ignore(pos, end, max_parsed_pos, expected))
		final = true;

	auto query = std::make_shared<ASTOptimizeQuery>(StringRange(begin, pos));
	node = query;

	if (database)
		query->database = typeid_cast<const ASTIdentifier &>(*database).name;
	if (table)
		query->table = typeid_cast<const ASTIdentifier &>(*table).name;
	if (partition)
		query->partition = apply_visitor(FieldVisitorToString(), typeid_cast<const ASTLiteral &>(*partition).value);
	query->final = final;

	return true;
}


}