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#pragma once
#include <Analyzer/IQueryTreePass.h>
namespace DB
{
/** Convert `if` with constant condition or `multiIf` with single constant condition into true condition argument value
* or false condition argument value.
*
* Example: SELECT if(1, true_value, false_value);
* Result: SELECT true_value;
*
* Example: SELECT if(0, true_value, false_value);
* Result: SELECT false_value;
*/
class IfConstantConditionPass final : public IQueryTreePass
{
public:
String getName() override { return "IfConstantCondition"; }
String getDescription() override { return "Optimize if, multiIf for constant condition."; }
void run(QueryTreeNodePtr query_tree_node, ContextPtr context) override;
};
}
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