jpountz commented on a change in pull request #769: LUCENE-8905: Better Error
Handling For Illegal Arguments
URL: https://github.com/apache/lucene-solr/pull/769#discussion_r307654649
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File path: lucene/core/src/java/org/apache/lucene/search/TopDocsCollector.java
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@@ -136,14 +136,21 @@ public TopDocs topDocs(int start, int howMany) {
// pq.size() or totalHits.
int size = topDocsSize();
- // Don't bother to throw an exception, just return an empty TopDocs in case
- // the parameters are invalid or out of range.
- // TODO: shouldn't we throw IAE if apps give bad params here so they dont
- // have sneaky silent bugs?
- if (start < 0 || start >= size || howMany <= 0) {
+
+ if (start < 0 || start > size) {
Review comment:
I don't think we should validate `start` against `size` since `size` depends
on the number of matches, and callers have no clue about its value at this
point? Otherwise we are making this method almost impossible to use?
The thing that we should validate is that `start + howMany` is less than or
equal to the `numHits` parameter (which doesn't seem to be passed to
TopDocsCollector by its sub classes at the moment, but we could)?
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