madrob commented on a change in pull request #592:
URL: https://github.com/apache/solr/pull/592#discussion_r798975829
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File path: solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java
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@@ -1384,16 +1385,24 @@ private void getDocListC(QueryResult qr, QueryCommand
cmd) throws IOException {
// - we don't want score returned.
// check if we should try and use the filter cache
- boolean useFilterCache = false;
- if ((flags & (GET_SCORES | NO_CHECK_FILTERCACHE)) == 0 &&
useFilterForSortedQuery && cmd.getSort() != null
- && filterCache != null) {
- useFilterCache = true;
- SortField[] sfields = cmd.getSort().getSort();
- for (SortField sf : sfields) {
- if (sf.getType() == SortField.Type.SCORE) {
- useFilterCache = false;
- break;
- }
+ final boolean needSort;
+ final boolean useFilterCache;
+ if ((flags & (GET_SCORES | NO_CHECK_FILTERCACHE)) != 0 || filterCache ==
null) {
+ needSort = true; // this value should be irrelevant when
`useFilterCache=false`
+ useFilterCache = false;
+ } else {
+ final Sort sort;
+ if (q instanceof MatchAllDocsQuery // special-case MatchAllDocsQuery:
implicit default useFilterForSortedQuery=true
+ || (useFilterForSortedQuery && q instanceof ConstantScoreQuery))
{ // default behavior should not risk filterCache thrashing
+ final SortField[] sortFields;
+ // We only need to sort if we're returning results AND sorting by
something other than SCORE (sort by
+ // "score" alone is pointless for these constant score queries)
+ needSort = cmd.getLen() > 0 && (sort = cmd.getSort()) != null &&
((sortFields = sort.getSort()).length > 1 || sortFields[0].getType() !=
Type.SCORE);
Review comment:
This complex conditional with nested assignments is fairly difficult to
read, can we expand to something less terse?
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