ctsk commented on code in PR #15301:
URL: https://github.com/apache/datafusion/pull/15301#discussion_r2022274853
##########
datafusion/physical-plan/src/topk/mod.rs:
##########
@@ -186,6 +235,90 @@ impl TopK {
Ok(())
}
+ fn calculate_dynamic_filters(
+ thresholds: Vec<ColumnThreshold>,
+ ) -> Result<Option<Arc<dyn PhysicalExpr>>> {
+ // Create filter expressions for each threshold
+ let mut filters: Vec<Arc<dyn PhysicalExpr>> =
Review Comment:
Been thinking about this too :D.
One could add another term to the generated expression:
```
passive OR <cur output of calculate_dynamic_filters>
```
`passive` itself is a dynamic literal that starts out as `true` and gets set
to `false` by the TopK Heap once the heap is full.
A downside of the DynamicLiteral approach is that it requires one mutex per
field (vs 1 mutex for the whole expression previously). For native types, this
*feels* like something that could be backed by an atomic, but I don't see an
easy way of achieving that.
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