Jinny-Wang commented on issue #14565:
URL: https://github.com/apache/lucene/issues/14565#issuecomment-2920601532
Hi @mkhludnev
> existing FilterWeight subclass can just drag second child-side scorer and
count and accept matching children
Are you referring to something like this?
```
private static class ToChildBlockJoinWeight extends FilterWeight {
private final BitSetProducer parentsFilter;
private final boolean doScores;
private final Weight childWeight;
public ToChildBlockJoinWeight(
Query joinQuery, Weight parentWeight, Weight childWeight,
BitSetProducer parentsFilter, boolean doScores) {
super(joinQuery, parentWeight);
this.parentsFilter = parentsFilter;
this.doScores = doScores;
this.childWeight = childWeight;
}
```
But the parent `FilterWeight` class implements a lot of the methods
https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/search/FilterWeight.java#L53
such as isCacheable() only using the joinQuery and the parentWeight here.
Ideally when adding a childQuery we'd want to use both parent and child weight.
How can we ensure that dragging a childWeight will make sure we are fully
backwards compatible while fully utilizing the childQuery?
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