Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19783#discussion_r154848018
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/EstimationUtils.scala
---
@@ -114,4 +114,194 @@ object EstimationUtils {
}
}
+ /**
+ * Returns the number of the first bin into which a column values falls
for a specified
+ * numeric equi-height histogram.
+ *
+ * @param value a literal value of a column
+ * @param bins an array of bins for a given numeric equi-height histogram
+ * @return the number of the first bin into which a column values falls.
+ */
+ def findFirstBinForValue(value: Double, bins: Array[HistogramBin]): Int
= {
+ var binId = 0
+ bins.foreach { bin =>
+ if (value > bin.hi) binId += 1
+ }
+ binId
+ }
+
+ /**
+ * Returns the number of the last bin into which a column values falls
for a specified
+ * numeric equi-height histogram.
+ *
+ * @param value a literal value of a column
+ * @param bins an array of bins for a given numeric equi-height histogram
+ * @return the number of the last bin into which a column values falls.
+ */
+ def findLastBinForValue(value: Double, bins: Array[HistogramBin]): Int =
{
--- End diff --
Why is this method so different from `findFirstBinForValue`? It looks like
we just need to reverse the iteration order, i.e. from `bins.length` to `0`.
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