rajat315315 commented on PR #16431:
URL: https://github.com/apache/lucene/pull/16431#issuecomment-5119357376
> Can we have an example and a test for a "homemade" function that followins
decreasing or increasing logic? I want this to be defined together with the
function!
I have attached a test specifying `DoubleValuesSource` where scoring is done
using `Math.sqrt()` which is a monotonically increasing function.
> The caller who constructs a FunctionQuery should not need to kown if the
function heshe uses is increasing!
The caller constructing a `FunctionScoreQuery` **does not need to know or
specify whether the function is increasing or decreasing**:
```java
// Clean, transparent caller API (no boolean flags needed):
Query query = new FunctionScoreQuery(baseQuery, doubleValuesSource);
```
> What happens if you use a ValueSource with an increasing function and you
wrap it with another decreasing function (nesting)?
When nesting functions $f(g(x))$, monotonicity composes deterministically:
| Outer Function | Inner Function | Composed
Result | Outer `getMaxScore()` Delegates To |
| :----------------------------| :----------------------------|
:----------------| :-------------------------------------------|
| **Increasing** ($\sqrt{u}$) | **Increasing** ($x$) | **Increasing**
| `inner.getMaxScore(upTo)` |
| **Increasing** ($\sqrt{u}$) | **Decreasing** ($-x$) | **Decreasing**
| `inner.getMaxScore(upTo)` (delegated down) |
| **Decreasing** ($-u$) | **Increasing** ($\sqrt{x}$) | **Decreasing**
| `inner.getMinScore(upTo)` |
| **Decreasing** ($-u$) | **Decreasing** ($-x$) | **Increasing**
| `inner.getMinScore(upTo)` |
If any layer in the nesting chain is non-monotonic or lacks skip index
information, it returns `Float.POSITIVE_INFINITY`, making nested expressions
safe by construction.
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