aws_lambda_function data source never updates, especially when qualifier changes

[t-pascal]

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Terraform Version

$ terraform -v
Terraform v0.11.7
+ provider.aws v1.19.0

Affected Resource(s)

• aws_lambda_function (data source)

Terraform Configuration Files

data "aws_lambda_function" "mylambda" {
  function_name = "my_function"
  qualifier     = "1"
}

output "mylambda_version" {
  value = "${data.aws_lambda_function.mylambda.qualified_arn}"
}

Debug Output

Panic Output

Expected Behavior

Apply:
mylambda_version = arn:aws:lambda:us-east-1:123456789:function:my_function:1

Change value to 2 and apply:
mylambda_version = arn:aws:lambda:us-east-1:123456789:function:my_function:2

Actual Behavior

Apply:

$terraform apply
provider.aws.region
  The region where AWS operations will take place. Examples
  are us-east-1, us-west-2, etc.

  Default: us-east-1
  Enter a value:

data.aws_lambda_function.mylambda: Refreshing state...

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

mylambda_version = arn:aws:lambda:us-east-1:12345678:function:my_function:1

Change qualifier:

data "aws_lambda_function" "mylambda" {
  function_name = "my_function"
  qualifier     = "2"
}

output "mylambda_version" {
  value = "${data.aws_lambda_function.mylambda.qualified_arn}"
}

Reapply:

$terraform apply
provider.aws.region
  The region where AWS operations will take place. Examples
  are us-east-1, us-west-2, etc.

  Default: us-east-1
  Enter a value:

data.aws_lambda_function.mylambda: Refreshing state...

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

mylambda_version = arn:aws:lambda:us-east-1:123456789:function:my_function:1

Taint???

terraform taint data.aws_lambda_function.mylambda
Resource 'data.aws_lambda_function.mylambda' cannot be tainted

Steps to Reproduce

1. terraform apply

2. Verify outputs

3. Change qualifier

4. terraform apply

5. Verify outputs are unchanged

6. In fact, data resource seems to never update again

Important Factoids

References

See #2984

[t-pascal]

I think I have verified that this bug in the data resource only returns the $LATEST version of the lambda, apparently ignoring the QUALIFIER flag.

[t-pascal]

I have no idea what changed, but the provider 1.23.0 seems to have fixed this issue? I will close this after a while if no one notices. Magic?

$ terraform -v
Terraform v0.11.7
+ provider.aws v1.23.0

[t-pascal]

Confirmed that this was fixed in 1.21.0 (2018 31 May) in PR #4654

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!