fixed the beam yaml create issue by creating the full dict

sdks/python/apache_beam/yaml/tests/create.yaml

@@ -30,7 +30,7 @@ pipelines:
               - {element: 2}
               - {element: 3}
               - {element: 4}
-              - {element: 5}  
+              - {element: 5}
 
   # Simple Create with more complex beam row
   - pipeline:
@@ -64,3 +64,20 @@ pipelines:
               - {first: 0, second: [1,2,3]}
               - {first: 1, second: [4,5,6]}
               - {first: 2, second: [7,8,9]}
+
+  # Simple Create with element list
+  - pipeline:
+      type: chain
+      transforms:
+        - type: Create
+          config:
+            elements:
+            - {sdk: MapReduce, year: 2004}
+            - {sdk: Flume}
+            - {sdk: MillWheel, year: 2008}
+        - type: AssertEqual
+          config:
+            elements:
+              - {sdk: MapReduce, year: 2004}
+              - {sdk: Flume}
+              - {sdk: MillWheel, year: 2008}

sdks/python/apache_beam/yaml/yaml_provider.py

@@ -785,9 +785,14 @@ def __init__(self, elements: Iterable[Any]):
       self._elements = elements
 
     def expand(self, pcoll):
+      def to_dict(row):
+        # filter None when comparing
+        temp_dict = {k: v for k, v in row._asdict().items() if v is not None}
+        return dict(temp_dict.items())
+
       return assert_that(
-          pcoll | beam.Map(lambda row: beam.Row(**row._asdict())),
-          equal_to(dicts_to_rows(self._elements)))
+          pcoll | beam.Map(to_dict),
+          equal_to([to_dict(e) for e in dicts_to_rows(self._elements)]))
 
   @staticmethod
   def create(elements: Iterable[Any], reshuffle: Optional[bool] = True):
@@ -838,7 +843,32 @@ def create(elements: Iterable[Any], reshuffle: Optional[bool] = True):
     # not the intent.
     if not isinstance(elements, Iterable) or isinstance(elements, (dict, str)):
       raise TypeError('elements must be a list of elements')
-    return beam.Create([element_to_rows(e) for e in elements],
+
+    # Check if elements have different keys
+    updated_elements = elements
+    if elements and all(isinstance(e, dict) for e in elements):
+      keys = [set(e.keys()) for e in elements]
+      if len(set.union(*keys)) > min(len(k) for k in keys):
+        # Merge all dictionaries to get all possible keys
+        all_keys = set()
+        for element in elements:
+          if isinstance(element, dict):
+            all_keys.update(element.keys())
+
+        # Create a merged dictionary with all keys
+        merged_dict = {}
+        for key in all_keys:
+          merged_dict[key] = None  # Use None as a default value
+
+        # Update each element with the merged dictionary
+        updated_elements = []
+        for e in elements:
+          if isinstance(e, dict):
+            updated_elements.append({**merged_dict, **e})
+          else:
+            updated_elements.append(e)
+
+    return beam.Create([element_to_rows(e) for e in updated_elements],
                        reshuffle=reshuffle is not False)
 
   # Or should this be posargs, args?