Snowflake: ALTER ... REFRESH can only be triggered on partitioned tables

[WesleyBatista]

Describe the bug

If one wants to trigger alter external table my_table refresh; on a Delta table that is not partitioned it's not possible because current implementation checks for external.partitions setting and if external.auto_refresh is false - ref.

Steps to reproduce

Example source.yml to consider:

version: 2

sources:
  - name: my_source
    database: my_database
    schema: my_schema

    tables:
      - name: my_table
        description: "my table"
        external:
          location: "@my_schema.my_stage/my_path/"
          file_format: "( type = parquet )"
          table_format: delta
          auto_refresh: false
          refresh_on_create: false
        columns:
          - name: col1
            data_type: varchar
          - name: col2
            data_type: varchar

then try to trigger a refresh:

dbt run-operation stage_external_sources --vars "ext_full_refresh: true"

Expected results

We should be able to trigger ALTER EXTERNAL TABLE ... REFRESH on non-partitioned Delta tables.

Actual results

Screenshots and log output

System information

The contents of your packages.yml file:

packages:
  - package: dbt-labs/dbt_utils
    version: 0.9.6
  - package: dbt-labs/codegen
    version: 0.8.0
  - package: calogica/dbt_expectations
    version: [">=0.8.0", "<0.9.0"]
  - package: elementary-data/elementary
    version: 0.7.4
  - git: https://github.com/WesleyBatista/dbt-external-tables
    revision: 028a2d733e9735e191d480f1bdbed4bbed84a50d

Which database are you using dbt with?

• redshift
• snowflake
• other (specify: ____________)

The output of dbt --version:

1.3

The operating system you're using:

The output of python --version:

Additional context

Using branch from #199 on DBT Cloud

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