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41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#pragma once
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#include <DB/Interpreters/Cluster.h>
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#include <DB/Parsers/IAST.h>
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#include <DB/Storages/IStorage.h>
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#include <DB/Client/ConnectionPool.h>
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namespace DB
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{
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struct Settings;
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class Context;
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class Cluster;
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class Throttler;
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namespace ClusterProxy
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{
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/// Base class for the implementation of the details of distributed query
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/// execution that are specific to the query type.
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class IQueryConstructor
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{
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public:
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virtual ~IQueryConstructor() {}
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/// Create an input stream for local query execution.
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virtual BlockInputStreamPtr createLocal(ASTPtr query_ast, const Context & context, const Cluster::Address & address) = 0;
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/// Create an input stream for remote query execution on one shard.
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virtual BlockInputStreamPtr createRemote(IConnectionPool * pool, const std::string & query,
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const Settings & settings, ThrottlerPtr throttler, const Context & context) = 0;
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/// Create an input stream for remote query execution on one or more shards.
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virtual BlockInputStreamPtr createRemote(ConnectionPoolsPtr & pools, const std::string & query,
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const Settings & new_settings, ThrottlerPtr throttler, const Context & context) = 0;
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/// Specify how we allocate connections on a shard.
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virtual PoolMode getPoolMode() const = 0;
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};
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}
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}
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