SYEDMDSAAD opened a new pull request, #15752:
URL: https://github.com/apache/lucene/pull/15752
This patch introduces FieldMinMax, a unified API to retrieve global
minimum and maximum numeric values for a field across an IndexReader.
Currently Lucene exposes two different mechanisms:
* PointValues.getMinPackedValue / getMaxPackedValue
- returns null when no values exist
* DocValuesSkipper.globalMinValue / globalMaxValue
- returns sentinel values when metadata is unavailable
This forces callers to understand internal storage details and manually
filter invalid values.
FieldMinMax abstracts over both implementations and provides consistent
behavior:
* Uses PointValues when available (accurate index statistics)
* Falls back to DocValuesSkipper when metadata exists
* Falls back to scanning NumericDocValues when skipper metadata is absent
* Returns null when no values exist
This prevents sentinel leakage and simplifies caller logic.
Tests cover:
- missing field
- point values
- doc values
- mixed segments
- empty segments
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