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_r303890610
##########
File path: lucene/core/src/java/org/apache/lucene/search/TopDocsCollector.java
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@@ -136,12 +136,14 @@ 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) {
- return newTopDocs(null, start);
+
+ if (start < 0 || start >= size) {
+ throw new IllegalArgumentException("Expected value of starting position
is between 0 and " + size +
+ ", got " + start);
+ }
+
+ if (howMany <= 0) {
+ throw new IllegalArgumentException("Number of hits requested must be
greater than 0");
Review comment:
can you add the value of `howMany` to the error message?
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