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#pragma once
#include <Interpreters/Context_fwd.h>
#include <Analyzer/IQueryTreeNode.h>
namespace DB
{
/** After query tree is build it can be later processed by query tree passes.
* This is abstract base class for all query tree passes.
*
* Query tree pass can make query tree modifications, after each pass query tree must be valid.
* Query tree pass must be isolated and perform only necessary query tree modifications for doing its job.
* Dependencies between passes must be avoided.
*/
class IQueryTreePass;
using QueryTreePassPtr = std::unique_ptr<IQueryTreePass>;
using QueryTreePasses = std::vector<QueryTreePassPtr>;
class IQueryTreePass
{
public:
virtual ~IQueryTreePass() = default;
/// Get query tree pass name
virtual String getName() = 0;
/// Get query tree pass description
virtual String getDescription() = 0;
/// Run pass over query tree
virtual void run(QueryTreeNodePtr query_tree_node, ContextPtr context) = 0;
};
}
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