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hover.schema.MATCH_PHASE.md Maven / Gradle / Ivy

## match-phase


Contained in [rank-profile](https://docs.vespa.ai/en/reference/schema-reference.html#rank-profile).
The match-phase feature lets you increase performance by limiting hits
exposed to first-phase ranking to the highest (lowest) values of some attribute.
The performance gain may be substantial, especially with an expensive first-phase function.
The quality loss is dependent on how well the chosen attribute correlates with the
first-phase score.

Documents which have no value of the chosen attribute will be taken as having the value 0.


  See also [graceful degradation](https://docs.vespa.ai/en/graceful-degradation.html#match-phase-degradation)
  and [result diversity](https://docs.vespa.ai/en/result-diversity.html#match-phase-diversity).

```
match-phase {
    attribute: [numeric single value attribute]
    order: [ascending | descending]
    max-hits: [integer]
}
``` 


[Read more](https://docs.vespa.ai/en/reference/schema-reference.html#match-phase)