ClickHouse/src/Parsers/Kusto/KustoFunctions/KQLMathematicalFunctions.h

#include "IParserKQLFunction.h"

namespace DB
{
class IsNan : public IParserKQLFunction
{
protected:
    const char * getName() const override { return "isnan()"; }
    bool convertImpl(String & out, IParser::Pos & pos) override;
};
}