AWS文章中的示例代码如下：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Effect": "Allow",
      "Resource": [
        "arn:aws:logs:*:*:*"
      ]
    }
  ]
}

该示例展示了如何为Lambda函数的执行角色添加一个AWS CloudWatch日志策略。

在Terraform中，您可以在Lambda函数定义块中使用“iam_role”的参数来创建新的IAM角色或将现有角色附加到Lambda函数。

以下是示例代码：

resource "aws_iam_role" "lambda_exec_role" {
  name = "lambda_exec_role"
  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = "sts:AssumeRole"
        Effect = "Allow"
        Principal = {
          Service = "lambda.amazonaws.com"
        }
      }
    ]
  })
}

resource "aws_lambda_function" "example" {
  function_name = "example"
  role          = aws_iam_role.lambda_exec_role.arn
  handler       = "handler"
  runtime       = "nodejs12.x"
  filename      = "lambda_handler.zip"
  source_code_hash = filebase64sha256("lambda_handler.zip")
}

resource "aws_iam_policy" "lambda_policy" {
  name        = "lambda_policy"
  policy      = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action   = "logs:CreateLogGroup"
        Effect   = "Allow"
        Resource = "*"
      },
      {
        Action   = "logs:CreateLogStream"
        Effect   = "Allow"
        Resource = "*"
      },
      {
        Action   = "logs:PutLogEvents"
        Effect   = "Allow"
        Resource = "*"
      }
    ]
  })
}

resource "aws_iam_role_policy_attachment" "lambda_policy_attach" {
  policy_arn = aws_iam_policy.lambda_policy.arn
  role       = aws_iam_role.lambda_exec_role.name
}

在代码中，我们首先定义了一个新的IAM角色"lambda_exec_role"，并定义了一个授予权限执行Lambda函数的策略"lambda_policy"。然后，我们将此策略附加到角色"lambda_exec_role"上，并在Lambda函数定义块中使用"role"参数将IAM角色与Lambda函数相关联。

请注意，您需要为Lambda函数包含代码和其他必要的配置，例如函数名称、运行时、处理程序和日志组。