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

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#pragma once
#include <DB/Parsers/IParserBase.h>
#include <DB/Parsers/CommonParsers.h>
#include <DB/Parsers/ExpressionElementParsers.h>
#include <DB/Parsers/ASTIdentifier.h>
#include <DB/Parsers/ASTShowProcesslistQuery.h>
namespace DB
{
/** Запрос SHOW PROCESSLIST
*/
class ParserShowProcesslistQuery : public IParserBase
{
protected:
const char * getName() const { return "SHOW PROCESSLIST query"; }
bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_parsed_pos, Expected & expected)
{
Pos begin = pos;
ParserWhiteSpaceOrComments ws;
ParserString s_show("SHOW", true, true);
ParserString s_processlist("PROCESSLIST", true, true);
ParserString s_format("FORMAT", true, true);
ASTPtr format;
ws.ignore(pos, end);
if (!s_show.ignore(pos, end, max_parsed_pos, expected))
return false;
ws.ignore(pos, end);
if (!s_processlist.ignore(pos, end, max_parsed_pos, expected))
return false;
ws.ignore(pos, end);
if (s_format.ignore(pos, end, max_parsed_pos, expected))
{
ws.ignore(pos, end);
ParserIdentifier format_p;
if (!format_p.parse(pos, end, format, max_parsed_pos, expected))
return false;
typeid_cast<ASTIdentifier &>(*format).kind = ASTIdentifier::Format;
ws.ignore(pos, end);
}
ASTShowProcesslistQuery * query = new ASTShowProcesslistQuery(StringRange(begin, pos));
query->format = format;
node = query;
return true;
}
};
}