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#pragma once
#include <Analyzer/IQueryTreePass.h>
namespace DB
{
/** Eliminate duplicate columns from ORDER BY and LIMIT BY.
*
* Example: SELECT * FROM test_table ORDER BY id, id;
* Result: SELECT * FROM test_table ORDER BY id;
*
* Example: SELECT * FROM test_table LIMIT 5 BY id, id;
* Result: SELECT * FROM test_table LIMIT 5 BY id;
*/
class OrderByLimitByDuplicateEliminationPass final : public IQueryTreePass
{
public:
String getName() override { return "OrderByLimitByDuplicateElimination"; }
String getDescription() override { return "Remove duplicate columns from ORDER BY, LIMIT BY."; }
void run(QueryTreeNodePtr query_tree_node, ContextPtr context) override;
};
}
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