jpountz commented on code in PR #14273:
URL: https://github.com/apache/lucene/pull/14273#discussion_r2014552652
##########
lucene/core/src/java/org/apache/lucene/search/DocIdStream.java:
##########
@@ -34,12 +33,35 @@ protected DocIdStream() {}
* Iterate over doc IDs contained in this stream in order, calling the given
{@link
* CheckedIntConsumer} on them. This is a terminal operation.
*/
- public abstract void forEach(CheckedIntConsumer<IOException> consumer)
throws IOException;
+ public void forEach(CheckedIntConsumer<IOException> consumer) throws
IOException {
+ forEach(DocIdSetIterator.NO_MORE_DOCS, consumer);
+ }
+
+ /**
+ * Iterate over doc IDs contained in this doc ID stream up to the given
{@code upTo} exclusive,
+ * calling the given {@link CheckedIntConsumer} on them. It is not possible
to iterate these doc
+ * IDs again later on.
+ */
+ public abstract void forEach(int upTo, CheckedIntConsumer<IOException>
consumer)
+ throws IOException;
/** Count the number of entries in this stream. This is a terminal
operation. */
public int count() throws IOException {
int[] count = new int[1];
forEach(doc -> count[0]++);
return count[0];
}
+
+ /**
+ * Count the number of doc IDs in this stream that are below the given
{@code upTo}. These doc IDs
+ * may not be consumed again later.
+ */
+ public int count(int upTo) throws IOException {
Review Comment:
> Are you thinking of peeking into these bit sets to provide cardinality up
to the specific doc? (Or maybe I'm missing something?)
Yes exactly. I have something locally already, I need to beef up testing a
bit.
The bitset-based `DocIdStream` is one interesting implementation, the other
interesting implementation is the one that is backed by a range of doc IDs that
all match. It is internally used by queries that fully match a segment (e.g.
`PointRangeQuery` when all the segment's values are contained in the query
range, or `MatchAllDocsQuery`) or queries on fields that are part of (or
correlate with) the index sort fields. See #14312 for reference.
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