jtibshirani commented on a change in pull request #185:
URL: https://github.com/apache/lucene/pull/185#discussion_r669839811
##########
File path:
lucene/sandbox/src/java/org/apache/lucene/sandbox/search/MultiNormsLeafSimScorer.java
##########
@@ -62,6 +67,14 @@
weightList.add(field.weight);
}
}
+
+ if (normsList.isEmpty() == false && normsList.size() !=
normFields.size()) {
+ throw new IllegalArgumentException(
+ getClass().getSimpleName()
+ + " requires norms to be consistent across fields: some fields
cannot"
+ + " have norms enabled, while others have norms disabled");
Review comment:
Doing more research, I don't think it's possible to detect if norms are
disabled upfront: `LeafReader#getNormsValues` could be `null` if a field uses
norms but happens to be missing from a segment. Using field infos would have
the same problem.
I opted to just document this requirement (as we do for the fact norms must
be additive and encoded in a certain way). If the calling application has its
own notion of schema, it can enforce the norms requirements upfront.
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