Can't compare against a lookup or map interpolation

[onlyanegg]

Terraform Version

Terraform v0.8.1

Affected Resource(s)

• Interpolation

Terraform Configuration Files

variable "role" {
  description = "Overwrite the role variable "
  default = "plat"
}
variable "elb_role" {
  type = "map"
  description = "Role name of ELB if provisioning multiple ELBs"
  default = {
    plat = 2
  }
}

Expected Behavior

Should have printed "yes"

Actual Behavior

Got a type error

Steps to Reproduce

$ terraform console
> lookup(var.elb_count, var.role)
2
> lookup(var.elb_count, var.role) > 1 ? "yes" : "no"
At column 3, line 1: <, >, <= and >= may apply only to int and float values in:

${lookup(var.elb_count, var.role) > 1 ? "yes" : "no"}
> var.elb_count[var.role] > 1 ? "yes" : "no"
At column 3, line 1: <, >, <= and >= may apply only to int and float values in:

${var.elb_count[var.role] > 1 ? "yes" : "no"}
> (var.elb_count[var.role] + 0) > 1 ? "yes" : "no"
yes
>

[apparentlymart]

Thanks for filing this, @onlyanegg! We discussed this a bit in Glitter chat.

The last line of the reproduction steps above is the workaround I would suggest for anyone running into this issue before it gets fixed.

I believe the issue here is that the comparison operators are not correctly promoting string operands to a numeric type as we'd do for arithmetic operators. This is the same class of problem as hashicorp/hil#43, so I may just fix them both together since it'll be touching similar areas of the code anyway.

[ghost]

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