add a fourth approach

dbt/include/snowflake/macros/relations/_rename_approach_4.sql

@@ -0,0 +1,83 @@
+/*
+This file was created for the sake of reviewing the two implementation options. This will be deleted prior to merging the PR.
+
+Implement at the `dbt-snowflake` level by overriding `snowflake__get_create_backup_sql()` and `snowflake__get_rename_intermediate_sql()`:
+- only affects `dbt-snowflake`
+- only affects backup/rename, which is where we're seeing the issue
+- still supports fully qualified names
+- still supports relations
+- still supports moving relations to another database and/or schema
+- rename macro behavior matches Snowflake rename behavior
+*/
+
+------------------------------------------ dbt-adapters ------------------------------------------
+{%- macro get_rename_sql(relation, new_name) -%}
+    /*
+    Args:
+        relation: BaseRelation - relation to be renamed
+        new_name: str - new identifier for `relation` (intended usage)
+    Returns: templated string
+    */
+    {{- log('Applying RENAME to: ' ~ relation) -}}
+    {{- adapter.dispatch('get_rename_sql', 'dbt')(relation, new_name) -}}
+{%- endmacro -%}
+
+
+{%- macro default__get_rename_sql(relation, new_name) -%}
+    {%- if relation.is_view -%}
+        {{ get_rename_view_sql(relation, new_name) }}
+
+    {%- elif relation.is_table -%}
+        {{ get_rename_table_sql(relation, new_name) }}
+
+    {%- elif relation.is_materialized_view -%}
+        {{ get_rename_materialized_view_sql(relation, new_name) }}
+
+    {%- else -%}
+        {{- exceptions.raise_compiler_error("`get_rename_sql` has not been implemented for: " ~ relation.type ) -}}
+
+    {%- endif -%}
+
+{%- endmacro -%}
+
+
+{% macro get_rename_view_sql(relation, new_name) %}
+    {{- adapter.dispatch('get_rename_view_sql', 'dbt')(relation, new_name) -}}
+{% endmacro %}
+
+
+------------------------------------------ dbt-snowflake ------------------------------------------
+------------ CHANGE: added the entire macro below ------------
+{%- macro snowflake__get_create_backup_sql(relation) -%}
+
+    -- get the standard backup name
+    {% set backup_relation = make_backup_relation(relation, relation.type) %}
+
+    -- drop any pre-existing backup
+    {{ get_drop_sql(backup_relation) }};
+
+    {{ get_rename_sql(relation, backup_relation.render()) }}
+
+{%- endmacro -%}
+
+
+------------ CHANGE: added the entire macro below ------------
+{%- macro snowflake__get_rename_intermediate_sql(relation) -%}
+
+    -- get the standard intermediate name
+    {% set intermediate_relation = make_intermediate_relation(relation) %}
+
+    {{ get_rename_sql(intermediate_relation, relation.render()) }}
+
+{%- endmacro -%}
+
+
+{%- macro snowflake__get_rename_view_sql(relation, new_name) -%}
+    /*
+    Args:
+        relation: BaseRelation - relation to be renamed
+        new_name: str - new identifier for `relation` (intended usage)
+    Returns: templated string
+    */
+    alter view {{ relation }} rename to {{ new_name }}
+{%- endmacro -%}