wuyunfeng edited a comment on issue #595: Load freqs lazily in Postings URL: https://github.com/apache/lucene-solr/pull/595#issuecomment-509905214 @atris Thanks. I noted that in Lucene's source-tree code. Impact `frequency ` and `norm ` just to accelerate the `score process` which `terminate early`. In impact mode, `CompetitiveImpactAccumulator` will record (freq, norm) pair that as you say stored at index level. Also I noted `CompetitiveImpactAccumulator` commented with `This class accumulates the (freq, norm) pairs that may produce competitive scores`, maybe related to `WAND`? I think maybe i got it... The norm value which produced or consumed by `Lucene80NormsFormat`. In this ` Impact way`, we can avoid read norms from `Lucene80NormsProducer` that may generate the extra IO? （ the norm value we stored twice.）
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