[GitHub] [phoenix] dbwong commented on a change in pull request #485: Add common utility function ScanUtil.splityKeyRangesByBoundaries()

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dbwong commented on a change in pull request #485: Add common utility function ScanUtil.splityKeyRangesByBoundaries()
URL: https://github.com/apache/phoenix/pull/485#discussion_r276039507
 
 

 ##########
 File path: phoenix-core/src/main/java/org/apache/phoenix/util/ScanUtil.java
 ##########
 @@ -953,4 +953,80 @@ public static int getClientVersion(Scan scan) {
     public static void setClientVersion(Scan scan, int version) {
         scan.setAttribute(BaseScannerRegionObserver.CLIENT_VERSION, Bytes.toBytes(version));
     }
+
+    /**
+     * Split the key ranges into multiple groups along the given boundaries
+     *
+     * @param boundaries
+     *     The boundaries is a byte[] list like "b0, b1, ..., bn" which forms
+     *     space (UNBOUND, b0), [b0, b1), ..., [bn, UNBOUND)
+     * @param keyRanges
+     *     The key ranges to split along the given boundaries. Coalesced.
+     * @return
+     *     key ranges in two dimensions.
+     */
+    public static List<List<KeyRange>> splitKeyRangesByBoundaries(List<byte[]> boundaries, List<KeyRange> keyRanges) {
+        if (boundaries == null || keyRanges == null || keyRanges.size() == 0) {
+            return null;
+        }
+
+        ScanUtil.BytesComparator comparator = ScanUtil.getComparator(true, SortOrder.ASC);
 
 Review comment:
   This doesn't seem to be configurable consider if static final field makes more sense.  Either is okay but as this will be allocated every query maybe keeping it around makes more sense?

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