ClickHouse/dbms/Parsers/ParserSystemQuery.cpp

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#include <Parsers/ParserSystemQuery.h>
#include <Parsers/ASTSystemQuery.h>
#include <Parsers/CommonParsers.h>
#include <Parsers/ExpressionElementParsers.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/parseDatabaseAndTableName.h>
namespace ErrorCodes
{
}
namespace DB
{
bool ParserSystemQuery::parseImpl(IParser::Pos & pos, ASTPtr & node, Expected & expected)
{
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if (!ParserKeyword{"SYSTEM"}.ignore(pos, expected))
return false;
using Type = ASTSystemQuery::Type;
auto res = std::make_shared<ASTSystemQuery>();
bool found = false;
for (int i = static_cast<int>(Type::UNKNOWN) + 1; i < static_cast<int>(Type::END); ++i)
{
Type t = static_cast<Type>(i);
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if (ParserKeyword{ASTSystemQuery::typeToString(t)}.ignore(pos, expected))
{
res->type = t;
found = true;
}
}
if (!found)
return false;
switch (res->type)
{
case Type::RELOAD_DICTIONARY:
{
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String cluster_str;
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if (ParserKeyword{"ON"}.ignore(pos, expected))
{
if (!ASTQueryWithOnCluster::parse(pos, cluster_str, expected))
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return false;
}
res->cluster = cluster_str;
ASTPtr ast;
if (ParserStringLiteral{}.parse(pos, ast, expected))
res->target_dictionary = ast->as<ASTLiteral &>().value.safeGet<String>();
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else if (!parseDatabaseAndTableName(pos, expected, res->database, res->target_dictionary))
return false;
break;
}
case Type::RESTART_REPLICA:
case Type::SYNC_REPLICA:
case Type::FLUSH_DISTRIBUTED:
if (!parseDatabaseAndTableName(pos, expected, res->database, res->table))
return false;
break;
case Type::STOP_MERGES:
case Type::START_MERGES:
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case Type::STOP_TTL_MERGES:
case Type::START_TTL_MERGES:
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case Type::STOP_MOVES:
case Type::START_MOVES:
case Type::STOP_FETCHES:
case Type::START_FETCHES:
case Type::STOP_REPLICATED_SENDS:
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case Type::START_REPLICATED_SENDS:
case Type::STOP_REPLICATION_QUEUES:
case Type::START_REPLICATION_QUEUES:
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case Type::STOP_DISTRIBUTED_SENDS:
case Type::START_DISTRIBUTED_SENDS:
parseDatabaseAndTableName(pos, expected, res->database, res->table);
break;
default:
/// There are no [db.table] after COMMAND NAME
break;
}
node = std::move(res);
return true;
}
}