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Window functions can't be evaluated #1796

@angelamayxie

Description

@angelamayxie

Discovered when adding tests to dolthub/go-mysql-server#3178. Tests fail in Doltgres but are valid queries in Postgres

Query: select row_number() over () as rn from o where c_id=1;
Error: a window function 'ROW_NUMBER' is in a context where it cannot be evaluated.

Query:  select o_id, c_id, rank() over(order by o_id) as rnk from o where c_id=1;
Error: a window function 'RANK' is in a context where it cannot be evaluated.

Query: select ship, dense_rank() over (order by ship) as drnk from o where c_id in (1, 2) order by ship;
Error: a window function 'DENSE_RANK' is in a context where it cannot be evaluated.

Query: SELECT * FROM (SELECT c_id AS c_c_id, bill FROM c) sq1, LATERAL (SELECT row_number() OVER () AS rownum FROM o WHERE c_id = c_c_id) sq2 ORDER BY c_c_id, bill, rownum;
Error: a window function 'ROW_NUMBER' is in a context where it cannot be evaluated.

Postgres results

postgres=# select row_number() over () as rn from o where c_id=1;
 rn 
----
  1
  2
  3
(3 rows)

postgres=# select o_id, c_id, rank() over(order by o_id) as rnk from o where c_id=1;
 o_id | c_id | rnk 
------+------+-----
   10 |    1 |   1
   20 |    1 |   2
   30 |    1 |   3
(3 rows)

postgres=# select ship, dense_rank() over (order by ship) as drnk from o where c_id in (1, 2) order by ship;
 ship | drnk 
------+------
 CA   |    1
 CA   |    1
 CA   |    1
 CA   |    1
 TX   |    2
      |    3
(6 rows)

postgres=# SELECT * FROM (SELECT c_id AS c_c_id, bill FROM c) sq1, LATERAL (SELECT row_number() OVER () AS rownum FROM o WHERE c_id = c_c_id) sq2 ORDER BY c_c_id, bill, rownum;
 c_c_id | bill | rownum 
--------+------+--------
      1 | CA   |      1
      1 | CA   |      2
      1 | CA   |      3
      2 | TX   |      1
      2 | TX   |      2
      2 | TX   |      3
      4 | TX   |      1
      4 | TX   |      2
      6 | FL   |      1
(9 rows)

Test currently tagged with Dialect: "mysql". Remove dialect tag once fixed.

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