[skip ci] revert maptofactory

Author: Baunsgaard

src/main/java/org/apache/sysds/runtime/compress/colgroup/mapping/MapToFactory.java

@@ -75,30 +75,21 @@ public static AMapToData create(int unique, IntArrayList values) {
 		return _data;
 	}
 
-	public static AMapToData create(int size, int[] values, int nUnique, int k) {
+	public static AMapToData create(int size, int[] values, int nUnique, int k) throws Exception {
+		AMapToData _data = create(size, nUnique);
 		final ExecutorService pool = CommonThreadPool.get(k);
-		try{
-
-			AMapToData _data = create(size, nUnique);
-			int blk = Math.max((values.length / k), 1024);
-			blk -= blk % 64; // ensure long size
-			List<Future<?>> tasks = new ArrayList<>();
-			for(int i = 0; i < values.length; i += blk) {
-				int start = i;
-				int end = Math.min(i + blk, values.length);
-				tasks.add(pool.submit(() -> _data.copyInt(values, start, end)));
-			}
-	
-			for(Future<?> t : tasks)
-				t.get();
-			return _data;
-		}
-		catch(Exception e){
-			throw new RuntimeException();
-		}
-		finally{
-			pool.shutdown();
+		int blk = Math.max((values.length / k), 1024);
+		blk -= blk % 64; // ensure long size
+		List<Future<?>> tasks = new ArrayList<>();
+		for(int i = 0; i < values.length; i += blk) {
+			int start = i;
+			int end = Math.min(i + blk, values.length);
+			tasks.add(pool.submit(() -> _data.copyInt(values, start, end)));
 		}
+
+		for(Future<?> t : tasks)
+			t.get();
+		return _data;
 	}
 
 	/**