presto-main/src/main/java/io/prestosql/operator/scalar/Re2JRegexpFunctions.java/Re2JRegexpFunctions/regexpSplit
class Re2JRegexpFunctions:    @ScalarFunction
    @Description("returns array of strings split by pattern")
    @LiteralParameters("x")
    @SqlType("array(varchar(x))")
    public static Block regexpSplit(@SqlType("varchar(x)") Slice source, @SqlType(Re2JRegexpType.NAME) Re2JRegexp pattern)
    {
        return pattern.split(source);
    }