[Bug] Snapshots and incremental models cannot add array columns

[tweavers]

Is this a new bug?

• I believe this is a new bug
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

Adding an array-type column to an existing snapshot or incremental model will result in the following syntax error.

alter table "postgres"."dbt_teddy_snapshots"."test_model_snapshot" add column "some_array" ARRAY;
Postgres adapter: Postgres error: syntax error at or near "ARRAY"

Example

# example_model.sql (before)
select
  1::numeric as col_a,
  2::int as col_b,
  'some_text' as col_c

# example_model.sql (after)
select
  1::numeric as col_a,
  2::int as col_b,
  'some_text' as col_c
  null::text[] as some_array

Expected Behavior

Alter table command should look like something like the following:
alter table "postgres"."dbt_snapshots"."example_model_snapshot" add column "some_array" text[];

Steps To Reproduce

1. Build above example_model with a downstream snapshot and incremental model
2. Add an array column to example_model
3. Build example_model and the downstream incremental models and snapshots

Relevant log output

14:41:28.002733 [debug] [Thread-1 (]: SQL status: SELECT 8 in 0.003 seconds
14:41:28.005418 [debug] [Thread-1 (]: Using postgres connection "snapshot.thymecare.test_model_snapshot"
14:41:28.005658 [debug] [Thread-1 (]: On snapshot.thymecare.test_model_snapshot: /* {"app": "dbt", "dbt_version": "1.8.6", "profile_name": "postgres", "target_name": "local", "node_id": "snapshot.thymecare.test_model_snapshot"} */

      alter table "postgres"."dbt_snapshots"."test_model_snapshot" add column "some_array" ARRAY;
    
14:41:28.009511 [debug] [Thread-1 (]: Postgres adapter: Postgres error: syntax error at or near "ARRAY"
LINE 3: ...pshots"."test_model_snapshot" add column "some_array" ARRAY;

Environment

- OS: Sequoia 15.0.1
- Python: 3.11.4
- dbt-postgres: 1.8.2

Additional Context

No response

[tweavers]

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