derrickaw commented on code in PR #35696:
URL: https://github.com/apache/beam/pull/35696#discussion_r2248300409


##########
sdks/python/apache_beam/yaml/tests/bigtable.yaml:
##########
@@ -85,3 +83,95 @@ pipelines:
             project: 'apache-beam-testing'
             instance: "{BT_INSTANCE}"
             table: 'test-table'
+  - pipeline:
+      type: chain
+      transforms:
+        - type: ReadFromBigTable
+          config:
+            project: 'apache-beam-testing'
+            instance: "{BT_INSTANCE}"
+            table: 'test-table'
+        - type: MapToFields
+          config:
+            language: python
+            fields:
+              key:
+                callable: |
+                  def convert_to_string(row):
+                    return row.key.decode("utf-8") if "key" in row._fields 
else None
+              family_name:
+                family_name
+              column_qualifier:
+                callable: |
+                  def convert_to_string(row):
+                    return row.column_qualifier.decode("utf-8") if 
"column_qualifier" in row._fields else None
+              cells:
+                callable: |
+                  def convert_to_string(row):
+                    cell_bytes = []
+                    for (value, timestamp) in row.cells:
+                      value_bytes = value.decode("utf-8")
+                      cell_bytes.append(beam.Row(value=value_bytes, 
timestamp_micros=timestamp))
+                    return cell_bytes
+        - type: AssertEqual
+          config:
+            elements:
+              - { key: 'row1',
+                  family_name: "cf1",
+                  column_qualifier: "cq1",
+                  cells:[{
+                    value: "value1",
+                    timestamp_micros: 5000}]}
+              - { key: 'row1',
+                  family_name: "cf1",
+                  column_qualifier: "cq2",
+                  cells: [{
+                    value: "value2",
+                    timestamp_micros: 1000 } ] }
+        - type: LogForTesting
+
+  - pipeline:
+      type: chain
+      transforms:
+        - type: ReadFromBigTable
+          config:
+            project: 'apache-beam-testing'
+            instance: "{BT_INSTANCE}"
+            table: 'test-table'
+            flatten: False
+        - type: MapToFields
+          config:
+            language: python
+            fields:
+              key:
+                callable: |
+                  def convert_to_bytes(row):
+                    return row.key.decode("utf-8") if "key" in row._fields 
else None
+
+              column_families:
+                column_families
+
+        - type: AssertEqual

Review Comment:
   it seems the failure is due to this assertion - two things:
   1. The assertion seems to not match the expected structure.  Should this 
assertion structure be revised or is the actual one correct?  If it just needs 
revising, revise it and then comment it out based on below.
   2. I know there is a BeamSchema issue that I don't think we can get around 
currently that we talked about - I would recommend opening an issue about it 
and assign me.  
   
   



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