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

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BinShi-SecularBird commented on a change in pull request #485: Add common utility function ScanUtil.splityKeyRangesByBoundaries()
URL: https://github.com/apache/phoenix/pull/485#discussion_r276237291
 
 

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 File path: phoenix-core/src/main/java/org/apache/phoenix/util/ScanUtil.java
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 @@ -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) {
 
 Review comment:
   boundaries' length can be 0.

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