Terraform：在aws_cloudfront_distribution资源中传递多个别名

Question

我正在尝试在aws_cloudfront_distribution中传递多个别名记录。我尝试使用连接使用分隔符从列表中分离字符串，但是它给出了以下错误。

resource "aws_cloudfront_distribution" "s3_distribution" {
...
...
...
aliases = [
    "${join(", ", var.aliases)}",
  ]
...
...
}

var.aliases在父模块中定义如下。

aliases     = ["a.domain.com", "b.domain.com"]

它正尝试如下替换当前记录。发生这种情况是因为我从GUI控制台添加了别名。

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

      ~ module.cms_cloudfront_distribution.aws_cloudfront_distribution.s3_distribution
 aliases.#:          "2" => "1"
 aliases.1679894134: "" => "a.domain.com, b.domain.com"
 aliases.2810533754: "a.domain.com" => ""
 aliases.3301490091: "b.domain.com" => ""