jpountz commented on PR #13359:
URL: https://github.com/apache/lucene/pull/13359#issuecomment-2176590274
I pushed a new approach. Instead of `prepareSeekExact` returning `void`, it
now returns a `Supplier` and forbids calling any other method on `TermsEnum`
until the `Supplier` has been consumed. There are two benefits:
- Implementations can early exit when they can figure out that the term
doesn't exist without doing any I/O by returning `null`. In turn, this saves
creating scorer on other required clauses of the same query.
- It is easier to split the work between the first and second phases
without duplicating work.
However, there is one downside, which is that you can only do one background
I/O request per `TermsEnum` instance, so you need multiple `TermsEnum`
instances if you want more I/O concurrency than that. This looks like a better
trade-off to me, it only makes things like `PKLookup` a bit more sophisticated
if they want to do I/O concurrency.
The benchmark still reports similar numbers:
Without the change
```
P50: 307
P90: 423
P99: 585
```
With the change
```
P50: 162
P90: 258
P99: 405
```
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