bool ParserTablePropertiesQuery::parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_parsed_pos, Expected & expected)
{
Pos begin = pos;
ParserWhitespaceOrComments ws;
ParserKeyword s_exists("EXISTS");
ParserKeyword s_describe("DESCRIBE");
ParserKeyword s_desc("DESC");
ParserKeyword s_show("SHOW");
ParserKeyword s_create("CREATE");
ParserKeyword s_table("TABLE");
ParserString s_dot(".");
ParserIdentifier name_p;
ASTPtr database;
ASTPtr table;
std::shared_ptr<ASTQueryWithTableAndOutput> query;
ws.ignore(pos, end);
if (s_exists.ignore(pos, end, max_parsed_pos, expected))
{
query = std::make_shared<ASTExistsQuery>();
}
else if (s_describe.ignore(pos, end, max_parsed_pos, expected) || s_desc.ignore(pos, end, max_parsed_pos, expected))
{
query = std::make_shared<ASTDescribeQuery>();
}
else if (s_show.ignore(pos, end, max_parsed_pos, expected))
{
ws.ignore(pos, end);
if (!s_create.ignore(pos, end, max_parsed_pos, expected))
return false;
query = std::make_shared<ASTShowCreateQuery>();
}
else
{
return false;
}
ws.ignore(pos, end);
s_table.ignore(pos, end, max_parsed_pos, expected);
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);
query->range = StringRange(begin, pos);
if (database)
query->database = typeid_cast<ASTIdentifier &>(*database).name;
if (table)
query->table = typeid_cast<ASTIdentifier &>(*table).name;
node = query;
return true;
}
bool ParserTablePropertiesQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
ParserKeyword s_exists("EXISTS");
ParserKeyword s_temporary("TEMPORARY");
ParserKeyword s_describe("DESCRIBE");
ParserKeyword s_desc("DESC");
ParserKeyword s_show("SHOW");
ParserKeyword s_create("CREATE");
ParserKeyword s_database("DATABASE");
ParserKeyword s_table("TABLE");
ParserToken s_dot(TokenType::Dot);
ParserIdentifier name_p;
ASTPtr database;
ASTPtr table;
std::shared_ptr<ASTQueryWithTableAndOutput> query;
bool parse_only_database_name = false;
if (s_exists.ignore(pos, expected))
{
query = std::make_shared<ASTExistsQuery>();
}
else if (s_show.ignore(pos, expected))
{
if (!s_create.ignore(pos, expected))
return false;
if (s_database.ignore(pos, expected))
{
parse_only_database_name = true;
query = std::make_shared<ASTShowCreateDatabaseQuery>();
}
else
query = std::make_shared<ASTShowCreateTableQuery>();
}
else
{
return false;
}
if (parse_only_database_name)
{
if (!name_p.parse(pos, database, expected))
return false;
}
else
{
if (s_temporary.ignore(pos, expected))
query->temporary = true;
s_table.ignore(pos, expected);
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 (database)
query->database = typeid_cast<ASTIdentifier &>(*database).name;
if (table)
query->table = typeid_cast<ASTIdentifier &>(*table).name;
node = query;
return true;
}
