CHB, Thank you! I had forgotten that discussion at the beginning of July [1]. Googling the list [2] also shows mention of PythonQL [3], which may point to use cases that can guide a Vectorization idea. [1] groupby discussion - https://mail.python.org/pipermail/python-ideas/2018-July/051786.html [2] google search - https://www.google.ca/search?q=group+by+site%3Ahttps%3A%2F%2Fmail.python.org%2Fpipermail%2Fpython-ideas%2F&oq=group+by+site%3Ahttps%3A%2F%2Fmail.python.org%2Fpipermail%2Fpython-ideas%2F [3] PythonQL - https://github.com/pythonql/pythonql On 2019-02-11 10:43, Christopher Barker wrote:
Do take a look in the fairly recent archives of this list for a big discussion of groupby -- it kind of petered out but there were a couple options on the table.
-CHB