abstractdog commented on a change in pull request #2225:
URL: https://github.com/apache/hive/pull/2225#discussion_r680929800
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/ValueBoundaryScanner.java
##########
@@ -664,6 +632,87 @@ public Object computeValue(Object row) throws
HiveException {
*/
public abstract boolean isEqual(Object v1, Object v2);
+ protected int binarySearchBack(int r, PTFPartition p, Object sortKey, int
amt,
+ Order order) throws HiveException {
+ boolean isOrderDesc = order.equals(Order.DESC);
+ Object rowVal = sortKey;
+
+ int rMin = -1; // tracks lowest possible number fulfilling the range
requirement
+ int rMax = r; // tracks highest possible number fulfilling the range
requirement
+
+ boolean isDistanceGreater = true;
+ while (true) {
+ if (rMin == rMax) {
+ return rMin;
+ }
+ isDistanceGreater =
+ isDistanceGreater(isOrderDesc ? rowVal : sortKey, isOrderDesc ?
sortKey : rowVal, amt);
+ if (!isDistanceGreater && r == 0) {
+ return 0;
+ }
+ if (isDistanceGreater) {
+ rMin = r + 1;
+ } else {
+ rMax = r;
+ }
+ r = rMin + (rMax - rMin) / 2;
Review comment:
"r" is the moving variable in this algorithm that tracks the currently
investigated row, and we already decided to rename this to "rowId" in the
method signature, so this will be rowId (as there is only 1 variable tracking
this)
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