msokolov commented on code in PR #16431:
URL: https://github.com/apache/lucene/pull/16431#discussion_r3676398949
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lucene/core/src/java/org/apache/lucene/search/DoubleValuesSource.java:
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@@ -46,6 +47,16 @@
*/
public abstract class DoubleValuesSource implements SegmentCacheable {
+ /** Monotonicity direction of a decoder function */
+ public enum Monotonicity {
+ /** Increasing function */
+ INCREASING,
Review Comment:
Also, if the function is a composite function, like `sum`, it is
non-increasing when both of its inputs are, but non-decreasing when both of its
inputs are, but when one is decreasing and the other one increasing, it is
undefined. I don't know how we can really expect this to work with general
functions
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