allow JIT

src/main/java/org/apache/sysds/runtime/frame/data/columns/Array.java

@@ -107,19 +107,24 @@ public synchronized final Map<T, Long> getRecodeMap() {
 	 * @return The recode map
 	 */
 	protected Map<T, Long> createRecodeMap() {
-		Map<T, Long> map = new HashMap<>();
+		final Map<T, Long> map = new HashMap<>();
 		long id = 1;
-		for(int i = 0; i < size(); i++) {
-			T val = get(i);
-			if(val != null) {
-				Long v = map.putIfAbsent(val, id);
-				if(v == null)
-					id++;
-			}
-		}
+		for(int i = 0; i < size(); i++)
+			id = addValRecodeMap(map, id, i);
+
 		return map;
 	}
 
+	private long addValRecodeMap(Map<T, Long> map, long id, int i) {
+		T val = get(i);
+		if(val != null) {
+			Long v = map.putIfAbsent(val, id);
+			if(v == null)
+				id++;
+		}
+		return id;
+	}
+
 	/**
 	 * Get the number of elements in the array, this does not necessarily reflect the current allocated size.
 	 * 

src/main/java/org/apache/sysds/runtime/transform/encode/CompressedEncode.java

@@ -122,10 +122,10 @@ private List<AColGroup> singleThread(List<ColumnEncoderComposite> encoders)
 	private List<AColGroup> multiThread(List<ColumnEncoderComposite> encoders)
 		throws InterruptedException, ExecutionException {
 		try {
-			List<Future<AColGroup>> tasks = new ArrayList<>(encoders.size());
+			final List<Future<AColGroup>> tasks = new ArrayList<>(encoders.size());
 			for(ColumnEncoderComposite c : encoders)
 				tasks.add(pool.submit(() -> encode(c)));
-			List<AColGroup> groups = new ArrayList<>(encoders.size());
+			final List<AColGroup> groups = new ArrayList<>(encoders.size());
 			for(Future<AColGroup> t : tasks)
 				groups.add(t.get());
 			return groups;