Disable ALLOW PARTIAL/DISALLOW PARTIAL in window function grammar

0: jdbc:drill:schema=dfs> select a2, sum(a2) over(partition by a2 order by a2 rows between 1 preceding and 1 following disallow partial) from t2 order by a2;
+-----+---------+
| a2  | EXPR$1  |
+-----+---------+
| 0   | null    |
| 1   | null    |
| 2   | 6       |
| 2   | 6       |
| 2   | 6       |
| 3   | null    |
| 4   | null    |
| 5   | null    |
| 6   | null    |
| 7   | 14      |
| 7   | 14      |
| 8   | null    |
| 9   | null    |
+-----+---------+
13 rows selected (0.213 seconds)

0: jdbc:drill:schema=dfs> select a2, sum(a2) over(partition by a2 order by a2 rows between 1 preceding and 1 following allow partial) from t2 order by a2;
+-----+---------+
| a2  | EXPR$1  |
+-----+---------+
| 0   | 0       |
| 1   | 1       |
| 2   | 6       |
| 2   | 6       |
| 2   | 6       |
| 3   | 3       |
| 4   | 4       |
| 5   | 5       |
| 6   | 6       |
| 7   | 14      |
| 7   | 14      |
| 8   | 8       |
| 9   | 9       |
+-----+---------+
13 rows selected (0.208 seconds)

0: jdbc:drill:schema=dfs> select a2, sum(a2) over(partition by a2 order by a2 disallow partial) from t2 order by a2;
Error: PARSE ERROR: From line 1, column 53 to line 1, column 68: Cannot use DISALLOW PARTIAL with window based on RANGE
[Error Id: 984c4b81-9eb0-401d-b36a-9580640b4a78 on atsqa4-133.qa.lab:31010] (state=,code=0)