feat: add aliases for several series properties (#80)

* feat: add aliases for several series properties

---------

Co-authored-by: Tim Swast <[email protected]>

Author: TrevorBergeron

bigframes/series.py

@@ -99,6 +99,10 @@ def shape(self) -> typing.Tuple[int]:
     def size(self) -> int:
         return self.shape[0]
 
+    @property
+    def ndim(self) -> int:
+        return 1
+
     @property
     def empty(self) -> bool:
         return self.shape[0] == 0
@@ -123,6 +127,13 @@ def query_job(self) -> Optional[bigquery.QueryJob]:
     def struct(self) -> structs.StructAccessor:
         return structs.StructAccessor(self._block)
 
+    @property
+    def T(self) -> Series:
+        return self.transpose()
+
+    def transpose(self) -> Series:
+        return self
+
     def _set_internal_query_job(self, query_job: bigquery.QueryJob):
         self._query_job = query_job
 
@@ -362,6 +373,8 @@ def ffill(self, *, limit: typing.Optional[int] = None) -> Series:
         window = bigframes.core.WindowSpec(preceding=limit, following=0)
         return self._apply_window_op(agg_ops.LastNonNullOp(), window)
 
+    pad = ffill
+
     def bfill(self, *, limit: typing.Optional[int] = None) -> Series:
         window = bigframes.core.WindowSpec(preceding=0, following=limit)
         return self._apply_window_op(agg_ops.FirstNonNullOp(), window)
@@ -743,6 +756,8 @@ def agg(self, func: str | typing.Sequence[str]) -> scalars.Scalar | Series:
                 agg_ops.lookup_agg_func(typing.cast(str, func))
             )
 
+    aggregate = agg
+
     def skew(self):
         count = self.count()
         if count < 3:

third_party/bigframes_vendored/pandas/core/series.py

@@ -64,6 +64,20 @@ def name(self) -> Hashable:
         """
         raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)
 
+    @property
+    def T(self) -> Series:
+        """Return the transpose, which is by definition self."""
+        raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)
+
+    def transpose(self) -> Series:
+        """
+        Return the transpose, which is by definition self.
+
+        Returns:
+            Series
+        """
+        raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)
+
     def reset_index(
         self,
         *,