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#pragma once
#include <Analyzer/IQueryTreePass.h>
namespace DB
{
/** Rewrite `sum(if(cond, value_1, value_2))` and `sumIf` functions to `countIf`.
*
* Example: SELECT sumIf(1, cond);
* Result: SELECT countIf(cond);
*
* Example: SELECT sum(if(cond, 1, 0));
* Result: SELECT countIf(cond);
*
* Example: SELECT sum(if(cond, 0, 1));
* Result: SELECT countIf(not(cond));
*/
class SumIfToCountIfPass final : public IQueryTreePass
{
public:
String getName() override { return "SumIfToCountIf"; }
String getDescription() override { return "Rewrite sum(if) and sumIf into countIf"; }
void run(QueryTreeNodePtr query_tree_node, ContextPtr context) override;
};
}
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