Add support for faster full count.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java b/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java
index dbf5690..b8035f0 100644
--- a/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java
+++ b/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java
@@ -51,6 +51,15 @@ public class FullScanQueryExecutor<S extends Storable> extends AbstractQueryExec
         mSupport = support;

     }

 

+    @Override

+    public long count(FilterValues<S> values) throws FetchException {

+        long count = mSupport.countAll();

+        if (count == -1) {

+            count = super.count(values);

+        }

+        return count;

+    }

+

     /**

      * Returns an open filter.

      */

@@ -83,6 +92,12 @@ public class FullScanQueryExecutor<S extends Storable> extends AbstractQueryExec
         Class<S> getStorableType();

 

         /**

+         * Counts all Storables. Implementation may return -1 to indicate that

+         * default count algorithm should be used.

+         */

+        long countAll() throws FetchException;

+

+        /**

          * Perform a full scan of all Storables.

          */

         Cursor<S> fetchAll() throws FetchException;