ClickHouse/dbms/src/Storages/SelectQueryInfo.h

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#pragma once
#include <memory>
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#include <unordered_map>
#include <Parsers/StringRange.h>
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namespace DB
{
class IAST;
using ASTPtr = std::shared_ptr<IAST>;
class ExpressionActions;
using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
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class Set;
using SetPtr = std::shared_ptr<Set>;
/// Information about calculated sets in right hand side of IN.
using PreparedSets = std::unordered_map<StringRange, SetPtr, StringRangePointersHash, StringRangePointersEqualTo>;
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struct PrewhereInfo
{
/// Actions which are executed on block in order to get filter column for prewhere step.
ExpressionActionsPtr prewhere_actions;
String prewhere_column_name;
bool remove_prewhere_column = false;
PrewhereInfo() = default;
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explicit PrewhereInfo(ExpressionActionsPtr prewhere_actions_, String prewhere_column_name_)
: prewhere_actions(std::move(prewhere_actions_)), prewhere_column_name(std::move(prewhere_column_name_)) {}
};
using PrewhereInfoPtr = std::shared_ptr<PrewhereInfo>;
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/** Query along with some additional data,
* that can be used during query processing
* inside storage engines.
*/
struct SelectQueryInfo
{
ASTPtr query;
PrewhereInfoPtr prewhere_info;
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/// Prepared sets are used for indices by storage engine.
/// Example: x IN (1, 2, 3)
PreparedSets sets;
};
}