Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19594#discussion_r156387841 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/EstimationUtils.scala --- @@ -114,4 +115,183 @@ object EstimationUtils { } } + /** + * Returns overlapped ranges between two histograms, in the given value range [newMin, newMax]. + */ + def getOverlappedRanges( + leftHistogram: Histogram, + rightHistogram: Histogram, + newMin: Double, + newMax: Double): Seq[OverlappedRange] = { --- End diff -- how about `upperBound`/`lowerBound`? It's hard to understand the meaning of `new` by looking at this method.
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