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48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
#pragma once
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#include <QueryPipeline/BlockIO.h>
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#include <Interpreters/Context_fwd.h>
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#include <Parsers/IAST_fwd.h>
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#include <Storages//IStorage_fwd.h>
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namespace DB
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{
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struct QueryLogElement;
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/** Interpreters interface for different queries.
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*/
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class IInterpreter
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{
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public:
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/** For queries that return a result (SELECT and similar), sets in BlockIO a stream from which you can read this result.
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* For queries that receive data (INSERT), sets a thread in BlockIO where you can write data.
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* For queries that do not require data and return nothing, BlockIO will be empty.
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*/
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virtual BlockIO execute() = 0;
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virtual bool ignoreQuota() const { return false; }
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virtual bool ignoreLimits() const { return false; }
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// Fill query log element with query kind, query databases, query tables and query columns.
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void extendQueryLogElem(
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QueryLogElement & elem,
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const ASTPtr & ast,
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ContextPtr context,
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const String & query_database,
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const String & query_table) const;
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virtual void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, ContextPtr) const {}
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/// Returns true if transactions maybe supported for this type of query.
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/// If Interpreter returns true, than it is responsible to check that specific query with specific Storage is supported.
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virtual bool supportsTransactions() const { return false; }
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/// Helper function for some Interpreters.
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static void checkStorageSupportsTransactionsIfNeeded(const StoragePtr & storage, ContextPtr context);
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virtual ~IInterpreter() = default;
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};
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}
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