arnavarora2004 commented on code in PR #35696:
URL: https://github.com/apache/beam/pull/35696#discussion_r2255786337


##########
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:
   Sounds good,



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