alamb commented on issue #13399:
URL: https://github.com/apache/datafusion/issues/13399#issuecomment-2475531224

   Thanks @jonathanc-n  -- here are some notes to help anyone who wants to help 
with this:
   
   What I normaly do is fire up `datafusion-cli` and copy/paste the result of 
the query into the code
   
   So for example, to  test `cume_dist`
   
   https://datafusion.apache.org/user-guide/sql/window_functions.html#cume-dist
   
   I would do
   
   ```shell
   > SELECT x, cume_dist() OVER (ORDER BY y) as cume_dist FROM VALUES (1,20), 
(2, 10), (3,30) t(x,y);
   +---+--------------------+
   | x | cume_dist          |
   +---+--------------------+
   | 2 | 0.3333333333333333 |
   | 1 | 0.6666666666666666 |
   | 3 | 1.0                |
   +---+--------------------+
   3 row(s) fetched.
   Elapsed 0.002 seconds.
   ```
   
   BTW the syntax 
   ```sql
   VALUES (1,20), (2, 10), (3,30) t(x,y);
   ```
   
   Basically creates a temporary table named `t` with columns `x` and `y`
   


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