Dandandan opened a new pull request #301:
URL: https://github.com/apache/arrow-datafusion/pull/301
# Which issue does this PR close?
Closes #300
# Rationale for this change
Currently we ignore OVER clauses, giving incorrect results (using normal
aggregates).
```
select 1, SUM(x) OVER (PARTITION by x) from (select 1 as x union all select
2 as x) t;
+----------+--------+
| Int64(1) | SUM(x) |
+----------+--------+
| 1 | 3 |
+----------+--------+
```
# What changes are included in this PR?
Return an error.
# Are there any user-facing changes?
Return error on not supported over clause.
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