Dandandan commented on code in PR #16433:
URL: https://github.com/apache/datafusion/pull/16433#discussion_r2154078467
##########
datafusion/physical-plan/src/topk/mod.rs:
##########
@@ -319,13 +341,88 @@ impl TopK {
/// (a > 2 OR (a = 2 AND b < 3))
/// ```
fn update_filter(&mut self) -> Result<()> {
- let Some(filter) = &self.filter else {
- return Ok(());
- };
let Some(thresholds) = self.heap.get_threshold_values(&self.expr)?
else {
return Ok(());
};
+ // Are the new thresholds more selective than our existing ones?
+ let should_update = {
+ if let Some(current) = self.filter.thresholds.write().as_mut() {
+ assert!(current.len() == thresholds.len());
+ // Check if new thresholds are more selective than current ones
+ let mut more_selective = false;
+ for ((current_value, new_value), sort_expr) in
+ current.iter().zip(thresholds.iter()).zip(self.expr.iter())
+ {
+ // Handle null cases
+ let (current_is_null, new_is_null) =
+ (current_value.is_null(), new_value.is_null());
Review Comment:
Can't we use `ScalarValue::partial_cmp`?
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