When using incremental tables, the column data types are invalidly up…

…dated (#269)

.changes/unreleased/Fixes-20240728-221030.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Incremental table varchar column definition changed
+time: 2024-07-28T22:10:30.673107-04:00
+custom:
+  Author: gshank
+  Issue: "276"

dbt/adapters/base/column.py

@@ -123,9 +123,6 @@ def numeric_type(cls, dtype: str, precision: Any, scale: Any) -> str:
         else:
             return "{}({},{})".format(dtype, precision, scale)
 
-    def __repr__(self) -> str:
-        return "<Column {} ({})>".format(self.name, self.data_type)
-
     @classmethod
     def from_description(cls, name: str, raw_data_type: str) -> "Column":
         match = re.match(r"([^(]+)(\([^)]+\))?", raw_data_type)

dbt/include/global_project/macros/materializations/models/incremental/incremental.sql

@@ -39,9 +39,12 @@
       {% set need_swap = true %}
   {% else %}
     {% do run_query(get_create_table_as_sql(True, temp_relation, sql)) %}
-    {% do adapter.expand_target_column_types(
-             from_relation=temp_relation,
-             to_relation=target_relation) %}
+    {% set contract_config = config.get('contract') %}
+    {% if not contract_config or not contract_config.enforced %}
+      {% do adapter.expand_target_column_types(
+               from_relation=temp_relation,
+               to_relation=target_relation) %}
+    {% endif %}
     {#-- Process schema changes. Returns dict of changes if successful. Use source columns for upserting/merging --#}
     {% set dest_columns = process_schema_changes(on_schema_change, temp_relation, existing_relation) %}
     {% if not dest_columns %}