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#include <Parsers/ASTUndropQuery.h>
#include <Parsers/CommonParsers.h>
#include <Parsers/ParserUndropQuery.h>
#include "Parsers/ASTLiteral.h"
namespace DB
{
namespace
{
bool parseUndropQuery(IParser::Pos & pos, ASTPtr & node, Expected & expected)
{
ParserKeyword s_table("TABLE");
ParserToken s_dot(TokenType::Dot);
ParserIdentifier name_p(true);
ASTPtr database;
ASTPtr table;
String cluster_str;
/// We can specify the table's uuid for exact undrop.
/// because the same name of a table can be created and deleted multiple times,
/// and can generate multiple different uuids.
UUID uuid = UUIDHelpers::Nil;
if (!s_table.ignore(pos, expected))
return false;
if (!name_p.parse(pos, table, expected))
return false;
if (s_dot.ignore(pos, expected))
{
database = table;
if (!name_p.parse(pos, table, expected))
return false;
}
if (ParserKeyword("UUID").ignore(pos, expected))
{
ParserStringLiteral uuid_p;
ASTPtr ast_uuid;
if (!uuid_p.parse(pos, ast_uuid, expected))
return false;
uuid = parseFromString<UUID>(ast_uuid->as<ASTLiteral>()->value.get<String>());
}
if (ParserKeyword{"ON"}.ignore(pos, expected))
{
if (!ASTQueryWithOnCluster::parse(pos, cluster_str, expected))
return false;
}
auto query = std::make_shared<ASTUndropQuery>();
node = query;
query->database = database;
query->table = table;
query->uuid = uuid;
if (database)
query->children.push_back(database);
assert (table);
query->children.push_back(table);
query->cluster = cluster_str;
return true;
}
}
bool ParserUndropQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
ParserKeyword s_undrop("UNDROP");
if (s_undrop.ignore(pos, expected))
return parseUndropQuery(pos, node, expected);
else
return false;
}
}
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