Add doctest example

Co-authored-by: Spencer Nelson <[email protected]>

quivr/tables.py

@@ -668,9 +668,23 @@ def column(self, column_name: str) -> pa.ChunkedArray:
         """
         Returns the column with the given name as a raw pyarrow ChunkedArray.
         Column can be a nested column, in which case, this function will recursively
-        search for the column through the nested subtables.
+        search for the column through the nested subtables using dot-delimited notation.
 
         :param column_name: The name of the column to return.
+
+        Examples:
+            >>> import quivr as qv
+            >>> import pyarrow.compute as pc
+            >>> class MySubTable(qv.Table):
+            ...     x = qv.Int64Column()
+            ...     y = qv.Int64Column()
+            >>> class MyWrapperTable(qv.Table):
+            ...     child = MySubTable.as_column()
+            >>> c = MySubTable.from_kwargs(x=[1, 2, 3], y=[4, 5, 6])
+            >>> p = MyWrapperTable.from_kwargs(child=c)
+            >>> column_x = p.column("c.x")
+            >>> print(column_x.to_pylist())
+            [1, 2, 3]
         """
         if "." in column_name:
             column_name, subkey = column_name.split(".", 1)