[BUGFIX] Column Descriptive Metrics: Skip finding semantic type info …

…for UNKNOWN columns (#8815)

great_expectations/experimental/metric_repository/column_descriptive_metrics_metric_retriever.py

@@ -45,8 +45,15 @@ def get_validator(self, batch_request: BatchRequest) -> Validator:
     def get_metrics(self, batch_request: BatchRequest) -> Sequence[Metric]:
         table_metrics = self._get_table_metrics(batch_request)
 
+        # We need to skip columns that do not report a type, because the metric computation
+        # to determine semantic type will fail.
+        table_column_types = list(
+            filter(lambda m: m.metric_name == "table.column_types", table_metrics)
+        )[0]
+        exclude_column_names = self._get_columns_to_exclude(table_column_types)
+
         numeric_column_names = self._get_numeric_column_names(
-            batch_request=batch_request
+            batch_request=batch_request, exclude_column_names=exclude_column_names
         )
         numeric_column_metrics = self._get_numeric_column_metrics(
             batch_request=batch_request, column_list=numeric_column_names
@@ -151,6 +158,13 @@ def _get_table_column_types(
             exception=exception,
         )
 
+    def _get_columns_to_exclude(self, table_column_types: Metric) -> List[str]:
+        columns_to_skip: List[str] = []
+        for column_type in table_column_types.value:
+            if column_type["type"] == "UNKNOWN":
+                columns_to_skip.append(column_type["name"])
+        return columns_to_skip
+
     def _get_numeric_column_metrics(
         self, batch_request: BatchRequest, column_list: List[str]
     ) -> Sequence[Metric]:
@@ -240,11 +254,16 @@ def _get_all_column_names(self, metrics: Sequence[Metric]) -> List[str]:
                 column_list = metric.value
         return column_list
 
-    def _get_numeric_column_names(self, batch_request: BatchRequest) -> list[str]:
+    def _get_numeric_column_names(
+        self,
+        batch_request: BatchRequest,
+        exclude_column_names: List[str],
+    ) -> list[str]:
         """Get the names of all numeric columns in the batch."""
         validator = self.get_validator(batch_request=batch_request)
         domain_builder = ColumnDomainBuilder(
             include_semantic_types=[SemanticDomainTypes.NUMERIC],
+            exclude_column_names=exclude_column_names,
         )
         assert isinstance(
             validator.active_batch, Batch