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#pragma once
#include <Analyzer/IQueryTreePass.h>
namespace DB
{
/** Remove single literal argument from `count`. Convert `sum` with single `1` literal argument into `count`.
*
* Example: SELECT count(1);
* Result: SELECT count();
*
* Example: SELECT sum(1);
* Result: SELECT count();
*/
class NormalizeCountVariantsPass final : public IQueryTreePass
{
public:
String getName() override { return "NormalizeCountVariants"; }
String getDescription() override { return "Optimize count(literal), sum(1) into count()."; }
void run(QueryTreeNodePtr query_tree_node, ContextPtr context) override;
};
}
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