alamb commented on code in PR #6419:
URL: https://github.com/apache/arrow-datafusion/pull/6419#discussion_r1204779057
##########
datafusion/sql/src/select.rs:
##########
@@ -70,10 +71,37 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
// process `where` clause
let plan = self.plan_selection(select.selection, plan,
planner_context)?;
+ // handle named windows before processing the projection expression
+ let mut modified_projection = select.projection.clone();
+ // If the projection is done over a named window, that window
+ // name must be defined. Otherwise, it gives an error.
+ for proj in modified_projection.iter_mut() {
+ if let SelectItem::ExprWithAlias {
+ expr: SQLExpr::Function(f),
+ alias: _,
+ } = proj
+ {
+ for NamedWindowDefinition(window_ident, window_spec) in
+ select.named_window.iter()
+ {
+ if let Some(WindowType::NamedWindow(ident)) = &f.over {
+ if ident.eq(window_ident) {
+ f.over =
Some(WindowType::WindowSpec(window_spec.clone()))
+ }
+ }
+ }
+ // All named windows must be defined with a WindowSpec.
Review Comment:
I recommend we do whatever postgres does (which I assume is throw an error,
but I haven't checked)
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