2015-06-18 02:11:05 +00:00
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#pragma once
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2017-04-01 09:19:00 +00:00
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#include <DataStreams/BlockIO.h>
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2020-12-14 03:30:39 +00:00
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#include <Parsers/IAST_fwd.h>
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2015-06-18 02:11:05 +00:00
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namespace DB
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{
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2020-12-14 03:30:39 +00:00
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struct QueryLogElement;
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class Context;
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2017-06-02 21:37:28 +00:00
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/** Interpreters interface for different queries.
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2015-06-18 02:11:05 +00:00
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*/
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class IInterpreter
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{
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public:
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2017-06-02 21:37:28 +00:00
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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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2017-04-01 07:20:54 +00:00
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*/
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virtual BlockIO execute() = 0;
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2015-06-18 02:11:05 +00:00
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2019-11-11 01:11:32 +00:00
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virtual bool ignoreQuota() const { return false; }
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virtual bool ignoreLimits() const { return false; }
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2020-12-14 03:30:39 +00:00
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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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2020-12-14 06:17:24 +00:00
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QueryLogElement & elem,
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const ASTPtr & ast,
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const Context & context,
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const String & query_database,
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const String & query_table) const;
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2020-12-14 03:30:39 +00:00
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virtual void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, const Context &) const {}
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2020-05-28 09:07:40 +00:00
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virtual ~IInterpreter() = default;
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2015-06-18 02:11:05 +00:00
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};
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}
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