mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-10 08:22:00 +00:00
31 lines
692 B
C++
31 lines
692 B
C++
#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;
|
|
|
|
};
|
|
|
|
}
|