iverase commented on code in PR #13563:
URL: https://github.com/apache/lucene/pull/13563#discussion_r1677661302
##########
lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90DocValuesProducer.java:
##########
@@ -1792,61 +1794,88 @@ public DocValuesSkipper getSkipper(FieldInfo field)
throws IOException {
if (input.length() > 0) {
input.prefetch(0, 1);
}
+ // TODO: should we write to disk the actual max level for this segment?
return new DocValuesSkipper() {
- int minDocID = -1;
- int maxDocID = -1;
- long minValue, maxValue;
- int docCount;
+ final int[] minDocID = new int[SKIP_INDEX_MAX_LEVEL];
+ final int[] maxDocID = new int[SKIP_INDEX_MAX_LEVEL];
+
+ {
+ for (int i = 0; i < SKIP_INDEX_MAX_LEVEL; i++) {
+ minDocID[i] = maxDocID[i] = -1;
+ }
+ }
+
+ final long[] minValue = new long[SKIP_INDEX_MAX_LEVEL];
+ final long[] maxValue = new long[SKIP_INDEX_MAX_LEVEL];
+ final int[] docCount = new int[SKIP_INDEX_MAX_LEVEL];
+ int levels;
@Override
public void advance(int target) throws IOException {
if (target > entry.maxDocId) {
- minDocID = DocIdSetIterator.NO_MORE_DOCS;
- maxDocID = DocIdSetIterator.NO_MORE_DOCS;
+ // skipper is exhausted
+ for (int i = 0; i < SKIP_INDEX_MAX_LEVEL; i++) {
+ minDocID[i] = maxDocID[i] = DocIdSetIterator.NO_MORE_DOCS;
+ }
} else {
+ // find next interval
+ assert target > maxDocID[0] : "target must be bigger that current
interval";
while (true) {
- maxDocID = input.readInt();
- if (maxDocID >= target) {
- minDocID = input.readInt();
- maxValue = input.readLong();
- minValue = input.readLong();
- docCount = input.readInt();
+ levels = input.readByte();
Review Comment:
mmm, advancing doc ids is different to exposing levels through the API. It
is related to the implementation of `#advance(int docID)`. We are currently
reading the next interval when we advance which can be inefficient on advancing
to an arbitrary doc ID.
We can probably do better there
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