presto-main/src/main/java/io/prestosql/type/LikeFunctions.java/LikeFunctions/likeChar
class LikeFunctions:    @ScalarFunction(value = "like", hidden = true)
    @LiteralParameters("x")
    @SqlType(StandardTypes.BOOLEAN)
    public static boolean likeChar(@LiteralParameter("x") Long x, @SqlType("char(x)") Slice value, @SqlType(LikePatternType.NAME) Regex pattern)
    {
        return likeVarchar(padSpaces(value, x.intValue()), pattern);
    }