Terraform reapplying permissions unnecessarily to PostgreSQL

[ootneim]

Description

Terraform is attempting to reapply permissions that should already be set. This is causing unnecessary replacement of postgresql_grant resources.

Example Output

The following output is from a terraform plan:

-/+ resource "postgresql_grant" "platform_profile_admin_public_sequence_flex" {
      ~ id                = "platform_profile_admin_profiledb_public_sequence" -> (known after apply)
      ~ privileges        = [ # forces replacement
          + "SELECT",
          + "UPDATE",
          + "USAGE",
        ]
        # (5 unchanged attributes hidden)
    }

  # postgresql_grant.platform_profile_admin_public_table_flex must be replaced
-/+ resource "postgresql_grant" "platform_profile_admin_public_table_flex" {
      ~ id                = "platform_profile_admin_profiledb_public_table" -> (known after apply)
      ~ privileges        = [ # forces replacement
          + "DELETE",
          + "INSERT",
          + "REFERENCES",
          + "SELECT",
          + "TRIGGER",
          + "TRUNCATE",
          + "UPDATE",
        ]
        # (5 unchanged attributes hidden)
    }

  # postgresql_grant.platform_profile_public_sequence_flex must be replaced
-/+ resource "postgresql_grant" "platform_profile_public_sequence_flex" {
      ~ id                = "platform_profile_profiledb_public_sequence" -> (known after apply)
      ~ privileges        = [ # forces replacement
          + "SELECT",
          + "UPDATE",
          + "USAGE",
        ]
        # (5 unchanged attributes hidden)
    }

  # postgresql_grant.platform_profile_public_table_flex must be replaced
-/+ resource "postgresql_grant" "platform_profile_public_table_flex" {
      ~ id                = "platform_profile_profiledb_public_table" -> (known after apply)
      ~ privileges        = [ # forces replacement
          + "DELETE",
          + "INSERT",
          + "REFERENCES",
          + "SELECT",
          + "TRIGGER",
          + "TRUNCATE",
          + "UPDATE",
        ]
        # (5 unchanged attributes hidden)
    }

[ootneim]

Updated postgresql provider with this fix:
cyrilgdn/terraform-provider-postgresql#321