alamb commented on code in PR #15033:
URL: https://github.com/apache/datafusion/pull/15033#discussion_r1996239262
##########
datafusion/core/tests/sql/sql_api.rs:
##########
@@ -19,6 +19,23 @@ use datafusion::prelude::*;
use tempfile::TempDir;
+#[tokio::test]
+async fn test_window_function() {
+ let ctx = SessionContext::new();
+ let df = ctx
+ .sql(
+ r#"SELECT
+ t1.v1,
+ SUM(t1.v1) OVER w + 1
+ FROM
+ generate_series(1, 10000) AS t1(v1)
+ WINDOW
Review Comment:
I think we should at least have a .slt test that shows this query running
and producing the same result as postgres, perhaps with a smaller number of
series:
```sql
postgres=# SELECT
t1.v1,
SUM(t1.v1) OVER w
FROM
generate_series(1, 5) AS t1(v1)
WINDOW
w AS (ORDER BY t1.v1 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW);
v1 | sum
----+-----
1 | 1
2 | 3
3 | 6
4 | 10
5 | 15
(5 rows)
```
##########
datafusion/sql/src/select.rs:
##########
@@ -887,29 +888,42 @@ fn match_window_definitions(
named_windows: &[NamedWindowDefinition],
) -> Result<()> {
for proj in projection.iter_mut() {
- if let SelectItem::ExprWithAlias {
- expr: SQLExpr::Function(f),
- alias: _,
- }
- | SelectItem::UnnamedExpr(SQLExpr::Function(f)) = proj
+ if let SelectItem::ExprWithAlias { expr, alias: _ }
+ | SelectItem::UnnamedExpr(expr) = proj
{
- for NamedWindowDefinition(window_ident, window_expr) in
named_windows.iter() {
- if let Some(WindowType::NamedWindow(ident)) = &f.over {
- if ident.eq(window_ident) {
- f.over = Some(match window_expr {
- NamedWindowExpr::NamedWindow(ident) => {
- WindowType::NamedWindow(ident.clone())
- }
- NamedWindowExpr::WindowSpec(spec) => {
- WindowType::WindowSpec(spec.clone())
+ let mut err = None;
+ visit_expressions_mut(expr, |expr| {
Review Comment:
I am sorry @chenkovsky and @2010YOUY01
I don't know what
```sql
SELECT
t1.v1,
SUM(t1.v1) OVER w + 1
FROM
generate_series(1, 10) AS t1(v1)
WINDOW
w AS (ORDER BY t1.v1);
```
Is supposed to be computing (what does adding one to a window definition
like `w +1` represent?)
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