optimize: Optimize RocksDB batch query performance

Author: lokidundun

hugegraph-server/hugegraph-rocksdb/src/main/java/org/apache/hugegraph/backend/store/rocksdb/RocksDBTable.java

@@ -20,6 +20,7 @@
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
@@ -180,7 +181,7 @@ protected BackendColumnIterator queryBy(RocksDBSessions.Session session, Query q
         // Query by id
         if (query.conditionsSize() == 0) {
             assert query.idsSize() > 0;
-            return this.queryByIds(session, query.ids());
+            return this.getByIds(session, new HashSet<>(query.ids()));
         }
 
         // Query by condition (or condition + id)

hugegraph-server/hugegraph-rocksdb/src/main/java/org/apache/hugegraph/backend/store/rocksdb/RocksDBTables.java

@@ -20,6 +20,7 @@
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.Collection;
+import java.util.HashSet;
 import java.util.List;
 
 import org.apache.hugegraph.backend.id.Id;
@@ -182,8 +183,7 @@ protected BackendColumnIterator queryById(RocksDBSessions.Session session, Id id
         @Override
         protected BackendColumnIterator queryByIds(RocksDBSessions.Session session,
                                                    Collection<Id> ids) {
-            // TODO: use getByIds() after batch version multi-get is ready
-            return super.queryByIds(session, ids);
+            return this.getByIds(session, new HashSet<>(ids));
         }
     }