PySpark code

df.select(df.colRegex("`(Col.)`")).show()
+----+----+
|Col1|Col2|
+----+----+
|   a|   1|
|   b|   2|
|   c|   3|
+----+----+

teradatamlspk code

>>> df.select(df.colRegex("(Col.)")).show()
+----+----+
|Col1|Col2|
+----+----+
|   c|   3|
|   b|   2|
|   a|   1|
+----+----+