iverase commented on a change in pull request #7:
URL: https://github.com/apache/lucene/pull/7#discussion_r745891282
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File path: lucene/core/src/java/org/apache/lucene/index/PointValues.java
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@@ -227,8 +228,59 @@ protected PointValues() {}
CELL_CROSSES_QUERY
};
+ /** Create a new {@link PointTree} to navigate the index */
+ public abstract PointTree getPointTree() throws IOException;
+
/**
- * We recurse the BKD tree, using a provided instance of this to guide the
recursion.
+ * Basic operations to read the KD-tree.
+ *
+ * @lucene.experimental
+ */
+ public interface PointTree extends Cloneable {
+
+ /**
+ * Clone, the current node becomes the root of the new tree. The method
should not be called
+ * after a successful call to {@link #moveToParent()}
Review comment:
The reason you cannot do it (and this constraint is the same in the
current version) is that you copy the current state of the tree, and in that
state we don't allow to moveToChild(). You need to be able to reset the tree to
the situation when you first arrived to the node... it is probably doable but
sure there will be a performance hit.
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