Add labels to unlabeled transforms

sdks/python/apache_beam/transforms/core.py

@@ -2352,11 +2352,15 @@ def expand(pcoll):
           else:
             return pcoll
 
+      # Map(lambda) produces a label formatted like this, but it cannot be
+      # changed without breaking update compat. Here, we pin to the transform
+      # name used in the 2.68 release to avoid breaking changes when the line
+      # number changes. Context: https://github.com/apache/beam/pull/36381
       input_count_view = pcoll | 'CountTotal' >> (
-          MaybeWindow() | Map(lambda _: 1)
+          MaybeWindow() | "Map(<lambda at core.py:2346>)" >> Map(lambda _: 1)
           | CombineGlobally(sum).as_singleton_view())
       bad_count_pcoll = result[self._dead_letter_tag] | 'CountBad' >> (
-          MaybeWindow() | Map(lambda _: 1)
+          MaybeWindow() | "Map(<lambda at core.py:2349>)" >> Map(lambda _: 1)
           | CombineGlobally(sum).without_defaults())
 
       def check_threshold(bad, total, threshold, window=DoFn.WindowParam):
@@ -3538,9 +3542,14 @@ def default_label(self):
 
   def expand(self, pcoll):
     input_type = pcoll.element_type or typing.Any
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
     return (
         pcoll
-        | Map(lambda x: (self._key_func()(x), x)).with_output_types(
+        | "Map(<lambda at core.py:3503>)" >>
+        Map(lambda x: (self._key_func()(x), x)).with_output_types(
             typehints.Tuple[self._key_type_hint(input_type), input_type])
         | GroupByKey())
 
@@ -3595,14 +3604,19 @@ def expand(self, pcoll):
     key_type_hint = self._grouping.force_tuple_keys(True)._key_type_hint(
         pcoll.element_type)
 
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
     return (
         pcoll
-        | Map(lambda x: (key_func(x), value_func(x))).with_output_types(
+        | "Map(<lambda at core.py:3560>)" >>
+        Map(lambda x: (key_func(x), value_func(x))).with_output_types(
             typehints.Tuple[key_type_hint, typing.Any])
         | CombinePerKey(
             TupleCombineFn(
                 *[combine_fn for _, combine_fn, __ in self._aggregations]))
-        | MapTuple(
+        | "MapTuple(<lambda at core.py:3565>)" >> MapTuple(
             lambda key, value: _dynamic_named_tuple('Result', result_fields)
             (*(key + value))))
 
@@ -3618,7 +3632,7 @@ class Select(PTransform):
 
   is the same as
 
-      pcoll | beam.Map(lambda x: beam.Row(a=x.a, b=foo(x)))
+      pcoll | 'label' >> beam.Map(lambda x: beam.Row(a=x.a, b=foo(x)))
   """
   def __init__(
       self,
@@ -3640,8 +3654,13 @@ def default_label(self):
     return 'ToRows(%s)' % ', '.join(name for name, _ in self._fields)
 
   def expand(self, pcoll):
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
     return (
-        _MaybePValueWithErrors(pcoll, self._exception_handling_args) | Map(
+        _MaybePValueWithErrors(pcoll, self._exception_handling_args)
+        | "Map(<lambda at core.py:3605>)" >> Map(
             lambda x: pvalue.Row(
                 **{
                     name: expr(x)
@@ -4128,10 +4147,15 @@ def expand(self, pcoll):
         else:
           return pcoll
 
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
     return (
         pbegin
         | Impulse()
-        | FlatMap(lambda _: serialized_values).with_output_types(bytes)
+        | "FlatMap(<lambda at core.py:4094>)" >>
+        FlatMap(lambda _: serialized_values).with_output_types(bytes)
         | MaybeReshuffle().with_output_types(bytes)
         | Map(self._coder.decode).with_output_types(self.get_output_type()))
 

sdks/python/apache_beam/transforms/external_java.py

@@ -145,7 +145,12 @@ def run_pipeline(pipeline_options, expansion_service, wait_until_finish=True):
             ImplicitSchemaPayloadBuilder({'data': 'middle'}),
             expansion_service)
         | beam.ExternalTransform(TEST_COUNT_URN, None, expansion_service)
-        | beam.Map(lambda kv: '%s: %s' % kv))
+        # Map(lambda) produces a label formatted like this, but it cannot be
+        # changed without breaking update compat. Here, we pin to the transform
+        # name used in the 2.68 release to avoid breaking changes when the line
+        # number changes. Context: https://github.com/apache/beam/pull/36381
+        | "Map(<lambda at external_java.py:148>)" >>
+        beam.Map(lambda kv: '%s: %s' % kv))
 
     assert_that(res, equal_to(['a: 3', 'b: 1', 'c: 2']))
 

sdks/python/apache_beam/transforms/util.py

@@ -1441,13 +1441,18 @@ def WithKeys(pcoll, k, *args, **kwargs):
       if all(isinstance(arg, AsSideInput)
              for arg in args) and all(isinstance(kwarg, AsSideInput)
                                       for kwarg in kwargs.values()):
-        return pcoll | Map(
+        # Map(lambda) produces a label formatted like this, but it cannot be
+        # changed without breaking update compat. Here, we pin to the transform
+        # name used in the 2.68 release to avoid breaking changes when the line
+        # number changes. Context: https://github.com/apache/beam/pull/36381
+        return pcoll | "Map(<lambda at util.py:1189>)" >> Map(
             lambda v, *args, **kwargs: (k(v, *args, **kwargs), v),
             *args,
             **kwargs)
-      return pcoll | Map(lambda v: (k(v, *args, **kwargs), v))
-    return pcoll | Map(lambda v: (k(v), v))
-  return pcoll | Map(lambda v: (k, v))
+      return pcoll | "Map(<lambda at util.py:1192>)" >> Map(
+          lambda v: (k(v, *args, **kwargs), v))
+    return pcoll | "Map(<lambda at util.py:1193>)" >> Map(lambda v: (k(v), v))
+  return pcoll | "Map(<lambda at util.py:1194>)" >> Map(lambda v: (k, v))
 
 
 @typehints.with_input_types(tuple[K, V])
@@ -1527,7 +1532,11 @@ def __init__(
 
     def expand(self, pcoll):
       key_type, value_type = pcoll.element_type.tuple_types
-      sharded_pcoll = pcoll | Map(
+      # Map(lambda) produces a label formatted like this, but it cannot be
+      # changed without breaking update compat. Here, we pin to the transform
+      # name used in the 2.68 release to avoid breaking changes when the line
+      # number changes. Context: https://github.com/apache/beam/pull/36381
+      sharded_pcoll = pcoll | "Map(<lambda at util.py:1275>)" >> Map(
           lambda key_value: (
               ShardedKey(
                   key_value[0],
@@ -2032,7 +2041,12 @@ def replace_all(pcoll, regex, replacement):
       replacement: the string to be substituted for each match.
     """
     regex = Regex._regex_compile(regex)
-    return pcoll | Map(lambda elem: regex.sub(replacement, elem))
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
+    return pcoll | "Map(<lambda at util.py:1779>)" >> Map(
+        lambda elem: regex.sub(replacement, elem))
 
   @staticmethod
   @typehints.with_input_types(str)
@@ -2048,7 +2062,12 @@ def replace_first(pcoll, regex, replacement):
       replacement: the string to be substituted for each match.
     """
     regex = Regex._regex_compile(regex)
-    return pcoll | Map(lambda elem: regex.sub(replacement, elem, 1))
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
+    return pcoll | "Map(<lambda at util.py:1795>)" >> Map(
+        lambda elem: regex.sub(replacement, elem, 1))
 
   @staticmethod
   @typehints.with_input_types(str)
@@ -2139,4 +2158,9 @@ def expand(self, pcoll):
             | f"WaitOn{ix}" >> (beam.FlatMap(lambda x: ()) | GroupByKey()))
         for (ix, side) in enumerate(self._to_be_waited_on)
     ]
-    return pcoll | beam.Map(lambda x, *unused_sides: x, *sides)
+    # Map(lambda) produces a label formatted like this, but it cannot be
+    # changed without breaking update compat. Here, we pin to the transform
+    # name used in the 2.68 release to avoid breaking changes when the line
+    # number changes. Context: https://github.com/apache/beam/pull/36381
+    return pcoll | "Map(<lambda at util.py:1886>)" >> beam.Map(
+        lambda x, *unused_sides: x, *sides)