mocobeta commented on a change in pull request #115:
URL: https://github.com/apache/lucene/pull/115#discussion_r623050451



##########
File path: 
lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90PostingsFormat.java
##########
@@ -235,6 +238,10 @@
  *             and stored as a difference sequence.
  *         <li>PayByteUpto indicates the start offset of the current payload. 
It is equivalent to
  *             the sum of the payload lengths in the current block up to 
PosBlockOffset
+ *         <li>ImpactLength is the total length of CompetitiveFreqDelta and 
CompetitiveNormDelta
+ *             pairs. CompetitiveFreqDelta and CompetitiveNormDelta are used 
to safely skip score
+ *             calculation for uncompetitive documents; See {@link
+ *             org.apache.lucene.codecs.CompetitiveImpactAccumulator} for more 
details.

Review comment:
       Also added brief description about the impacts.




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