fix: handle dbt deferral in get_elementary_relation (#1006)

* fix: handle dbt deferral in get_elementary_relation

When --favor-state or --defer is active, Elementary models may not be
built in the CI target schema. adapter.get_relation() returns None in
this case, causing anomaly tests to fail with 'relation "none" does
not exist'.

Fall back to constructing a Relation from graph node coordinates when
the physical catalog lookup returns None but the node exists in the
dbt graph. This allows the generated SQL to reference the correct
(deferred) schema.

Co-Authored-By: Noy Arie <noyarie1992@gmail.com>

* fix: gate deferral fallback on --defer/--favor-state flags

Only construct a synthetic Relation when dbt deferral is actually
active (invocation_args_dict.defer or favor_state). Without this
guard, the fallback would fire for any installed Elementary model
whose table doesn't exist yet (e.g. partial dbt run), breaking
callers that rely on a None return to detect missing tables.

Co-Authored-By: Noy Arie <noyarie1992@gmail.com>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: NoyaArie

macros/utils/graph/get_elementary_relation.sql

@@ -20,10 +20,32 @@
         {% if this and this.database == elementary_database and this.schema == elementary_schema and this.identifier == identifier_alias %}
             {% do return(this) %}
         {% endif %}
-        {% do return(
-            adapter.get_relation(
-                elementary_database, elementary_schema, identifier_alias
+        {% set relation = adapter.get_relation(
+            elementary_database, elementary_schema, identifier_alias
+        ) %}
+        {% if relation is not none %} {% do return(relation) %} {% endif %}
+        {# Relation not found in the target schema. Under dbt deferral
+           (--favor-state / --defer) the Elementary models may exist only
+           in the deferred (e.g. prod) schema and not in the current
+           target. Construct a relation from the graph node coordinates
+           so the generated SQL references the correct schema instead of
+           rendering "from None". #}
+        {% set is_defer = (
+            (
+                invocation_args_dict.get("defer", false)
+                or invocation_args_dict.get("favor_state", false)
             )
+            if invocation_args_dict
+            else false
         ) %}
+        {% if identifier_node and is_defer %}
+            {% do return(
+                api.Relation.create(
+                    database=elementary_database,
+                    schema=elementary_schema,
+                    identifier=identifier_alias,
+                )
+            ) %}
+        {% endif %}
     {%- endif %}
 {% endmacro %}