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65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
#pragma once
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#include <Interpreters/IInterpreter.h>
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#include <Parsers/IAST_fwd.h>
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#include <Storages/IStorage_fwd.h>
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#include <Interpreters/StorageID.h>
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#include <Common/ActionLock.h>
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#include <Disks/IVolume.h>
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namespace Poco { class Logger; }
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namespace DB
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{
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class Context;
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class AccessRightsElements;
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class ASTSystemQuery;
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/** Implement various SYSTEM queries.
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* Examples: SYSTEM SHUTDOWN, SYSTEM DROP MARK CACHE.
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*
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* Some commands are intended to stop/start background actions for tables and comes with two variants:
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*
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* 1. SYSTEM STOP MERGES table, SYSTEM START MERGES table
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* - start/stop actions for specific table.
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*
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* 2. SYSTEM STOP MERGES, SYSTEM START MERGES
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* - start/stop actions for all existing tables.
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* Note that the actions for tables that will be created after this query will not be affected.
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*/
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class InterpreterSystemQuery : public IInterpreter
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{
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public:
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InterpreterSystemQuery(const ASTPtr & query_ptr_, Context & context_);
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BlockIO execute() override;
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private:
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ASTPtr query_ptr;
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Context & context;
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Poco::Logger * log = nullptr;
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StorageID table_id = StorageID::createEmpty(); /// Will be set up if query contains table name
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VolumePtr volume_ptr;
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/// Tries to get a replicated table and restart it
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/// Returns pointer to a newly created table if the restart was successful
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StoragePtr tryRestartReplica(const StorageID & replica, Context & context, bool need_ddl_guard = true);
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void restartReplicas(Context & system_context);
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void syncReplica(ASTSystemQuery & query);
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void dropReplica(ASTSystemQuery & query);
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bool dropReplicaImpl(ASTSystemQuery & query, const StoragePtr & table);
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void flushDistributed(ASTSystemQuery & query);
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AccessRightsElements getRequiredAccessForDDLOnCluster() const;
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void startStopAction(StorageActionBlockType action_type, bool start);
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void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, const Context &) const override;
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};
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}
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