javanna commented on code in PR #11793:
URL: https://github.com/apache/lucene/pull/11793#discussion_r975048307
##########
lucene/core/src/java/org/apache/lucene/index/PointValues.java:
##########
@@ -467,4 +467,91 @@ public final long estimateDocCount(IntersectVisitor
visitor) {
/** Returns the total number of documents that have indexed at least one
point. */
public abstract int getDocCount();
+
+ private static final PointTree EMPTY_POINT_TREE =
+ new PointTree() {
+ @Override
+ public PointTree clone() {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean moveToChild() {
+ return false;
+ }
+
+ @Override
+ public boolean moveToSibling() {
+ return false;
+ }
+
+ @Override
+ public boolean moveToParent() {
+ return false;
+ }
+
+ @Override
+ public byte[] getMinPackedValue() {
+ return new byte[0];
+ }
+
+ @Override
+ public byte[] getMaxPackedValue() {
+ return new byte[0];
+ }
+
+ @Override
+ public long size() {
+ return 0;
+ }
+
+ @Override
+ public void visitDocIDs(IntersectVisitor visitor) {}
+
+ @Override
+ public void visitDocValues(IntersectVisitor visitor) {}
+ };
+
+ public static final PointValues EMPTY =
+ new PointValues() {
+ @Override
+ public PointTree getPointTree() {
+ return EMPTY_POINT_TREE;
+ }
+
+ @Override
+ public byte[] getMinPackedValue() {
+ return null;
+ }
+
+ @Override
+ public byte[] getMaxPackedValue() {
+ return null;
Review Comment:
returning null here does not feel great, yet I did not find a better way
that fits in the existing code. I tried the empty array but it required changes
in how the return value is consumed.
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