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58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
#pragma once
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#include <Parsers/IAST.h>
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#include <Parsers/IParser.h>
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namespace DB
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{
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/// TODO: Quite messy.
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class ASTQueryWithOnCluster
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{
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public:
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using Pos = IParser::Pos;
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/// Should be parsed from ON CLUSTER <cluster> clause
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String cluster;
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/// new_database should be used by queries that refer to default db
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/// and default_database is specified for remote server
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virtual ASTPtr getRewrittenASTWithoutOnCluster(const std::string & new_database = {}) const = 0;
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/// Returns a query prepared for execution on remote server
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std::string getRewrittenQueryWithoutOnCluster(const std::string & new_database = {}) const;
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void formatOnCluster(const IAST::FormatSettings & settings) const;
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/// Parses " CLUSTER [cluster|'cluster'] " clause
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static bool parse(Pos & pos, std::string & cluster_str, Expected & expected);
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virtual ~ASTQueryWithOnCluster() = default;
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ASTQueryWithOnCluster() = default;
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ASTQueryWithOnCluster(const ASTQueryWithOnCluster &) = default;
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ASTQueryWithOnCluster & operator=(const ASTQueryWithOnCluster &) = default;
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protected:
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template <typename T>
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static ASTPtr removeOnCluster(ASTPtr query_ptr, const std::string & new_database)
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{
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T & query = static_cast<T &>(*query_ptr);
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query.cluster.clear();
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if (query.database.empty())
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query.database = new_database;
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return query_ptr;
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}
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template <typename T>
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static ASTPtr removeOnCluster(ASTPtr query_ptr)
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{
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T & query = static_cast<T &>(*query_ptr);
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query.cluster.clear();
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return query_ptr;
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}
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};
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}
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