ClickHouse/dbms/src/Storages/SelectQueryInfo.h

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#pragma once
#include <memory>
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#include <unordered_map>
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namespace DB
{
class IAST;
using ASTPtr = std::shared_ptr<IAST>;
class Set;
using SetPtr = std::shared_ptr<Set>;
/// Information about calculated sets in right hand side of IN.
using PreparedSets = std::unordered_map<IAST*, SetPtr>;
/** Query along with some additional data,
* that can be used during query processing
* inside storage engines.
*/
struct SelectQueryInfo
{
ASTPtr query;
/// Prepared sets are used for indices by storage engine.
/// Example: x IN (1, 2, 3)
PreparedSets sets;
};
}