ClickHouse/dbms/include/DB/Functions/Conditional/StringEvaluator.h

#pragma once

#include <DB/Core/Block.h>
#include <DB/Core/ColumnNumbers.h>

namespace DB
{

namespace Conditional
{

struct StringEvaluator final
{
	/// The tracker parameter is an index to a column that tracks the originating column of each value of
	/// the result column. Calling this function with result == tracker means that no such tracking is
	/// required, which happens if multiIf is called with no nullable parameters.
	static bool perform(Block & block, const ColumnNumbers & args, size_t result, size_t tracker);
};

}

}