pgaref commented on a change in pull request #2225:
URL: https://github.com/apache/hive/pull/2225#discussion_r681829001
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/ValueBoundaryScanner.java
##########
@@ -664,6 +629,84 @@ public Object computeValue(Object row) throws
HiveException {
*/
public abstract boolean isEqual(Object v1, Object v2);
+ protected int binarySearchBack(int rowId, PTFPartition p, Object sortKey,
int amt,
+ Order order) throws HiveException {
+ boolean isOrderDesc = order.equals(Order.DESC);
+ Object rowVal = sortKey;
+
+ int rMin = 0; // tracks lowest possible number fulfilling the range
requirement
+ int rMax = rowId; // tracks highest possible number fulfilling the range
requirement
+
+ boolean isDistanceGreater = true;
+ while (rMin < rMax) {
+ isDistanceGreater = isDistanceGreater(isOrderDesc ? rowVal : sortKey,
isOrderDesc ? sortKey : rowVal, amt);
+ if (isDistanceGreater) {
+ rMin = rowId + 1;
+ } else {
+ rMax = rowId;
+ }
+ rowId = rMin + (rMax - rMin) / 2;
+ rowVal = computeValueUseCache(rowId, p);
+ }
+ return rMin;
+ }
+
+ private int linearSearchBack(int r, PTFPartition p, Object sortKey, int amt,
+ Order order) throws HiveException {
+ boolean isOrderDesc = order.equals(Order.DESC);
+ Object rowVal = sortKey;
+ while (r >= 0 && !isDistanceGreater(isOrderDesc ? rowVal : sortKey,
+ isOrderDesc ? sortKey : rowVal, amt)) {
+ Pair<Integer, Object> stepResult = skipOrStepBack(r, p);
+ r = stepResult.getLeft();
+ rowVal = stepResult.getRight();
+ }
+ return r + 1;
+ }
+
+ protected int binarySearchForward(int rowId, PTFPartition p, Object sortKey,
int amt,
+ Order order) throws HiveException {
+ boolean isOrderDesc = order.equals(Order.DESC);
+ Object rowVal = sortKey;
+ int rMin = rowId; // tracks lowest possible number fulfilling the range
requirement
+ int rMax = p.size(); // tracks highest possible number fulfilling the
range requirement
+
+ boolean isDistanceGreater = true;
+ while (rMin < rMax) {
+ isDistanceGreater =
+ isDistanceGreater(isOrderDesc ? sortKey : rowVal, isOrderDesc ?
rowVal : sortKey, amt);
+ /*
+ * if the currently inspected row is the last (p.size() - 1) but we're
not far enough to fulfill
+ * the range requirement (!isDistanceGreater), we cannot move forward,
let's simply return p.size(),
+ * range end is exclusive
+ */
+ if (!isDistanceGreater && rowId == p.size() - 1) {
Review comment:
The second approach sounds reasonable to me -- just to clarify: is
IndexOutOfBoundsException thrown from computeValueUseCache call ? rowVal should
be calculated at the beginning of each loop -- for example before ```if
(isDistanceGreater)``` -- this could avoid the exception
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