fix: case-insensitive Snowflake relation matching for catalog lookup in get_columns

src/dbt_osmosis/core/introspection.py

@@ -1154,16 +1154,27 @@ def process_column(c: BaseColumn | ColumnMetadata, /) -> None:
 
     if catalog := context.read_catalog():
         logger.debug(":blue_book: Catalog found => Checking for ref => %s", rendered_relation)
-        matcher = getattr(relation_any, "matches", None)
-
-        def matches_relation(entry: t.Any) -> bool:
-            if not callable(matcher):
-                return False
-            return bool(matcher(*entry.key()))
-
+
+        def matches_relation_case_insensitive(c: t.Any) -> bool:
+            #For Snowflake, use case-insensitive matching
+            if context.project.runtime_cfg.credentials.type == "snowflake": 
+                try:
+                    catalog_key = tuple(
+                        k.upper() if isinstance(k, str) else k for k in c.key()
+                    )
+                    relation_key = tuple(
+                        k.upper() if isinstance(k, str) else k 
+                        for k in (relation.database, relation.schema, relation.name)
+                    )
+                    return catalog_key == relation_key
+                except Exception:
+                    pass
+            # Default to case-ensitive matching:
+            return relation.matches(*c.key())
+
         catalog_entry = _find_first(
             chain(catalog.nodes.values(), catalog.sources.values()),
-            matches_relation,
+            matches_relation_case_insensitive,
         )
         if catalog_entry:
             logger.info(