suibianwanwank commented on code in PR #16234:
URL: https://github.com/apache/datafusion/pull/16234#discussion_r2125728466
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datafusion/physical-expr/src/window/window_expr.rs:
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@@ -186,6 +186,10 @@ pub trait AggregateWindowExpr: WindowExpr {
accumulator: &mut Box<dyn Accumulator>,
) -> Result<ScalarValue>;
+ /// Indicates whether this window function always produces the same result
+ /// for all rows in the partition.
+ fn is_constant(&self) -> bool;
Review Comment:
Good point, I'll address it a bit later.
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