debug error

Author: Baunsgaard

src/main/java/org/apache/sysds/runtime/transform/decode/DecoderPassThrough.java

@@ -60,16 +60,27 @@ public FrameBlock decode(MatrixBlock in, FrameBlock out) {
 
 	@Override
 	public void decode(MatrixBlock in, FrameBlock out, int rl, int ru) {
-		int clen = Math.min(_colList.length, out.getNumColumns());
-		for( int i=rl; i<ru; i++ ) {
-			for( int j=0; j<clen; j++ ) {
-				int srcColID = _srcCols[j];
-				int tgtColID = _colList[j];
-				double val = in.get(i, srcColID-1);
-				out.set(i, tgtColID-1,
-					UtilFunctions.doubleToObject(_schema[tgtColID-1], val));
+		try{
+
+			int clen = Math.min(_colList.length, out.getNumColumns());
+			for( int i=rl; i<ru; i++ ) {
+				for( int j=0; j<clen; j++ ) {
+					int srcColID = _srcCols[j];
+					int tgtColID = _colList[j];
+					double val = in.get(i, srcColID-1);
+					out.set(i, tgtColID-1,
+						UtilFunctions.doubleToObject(_schema[tgtColID-1], val));
+				}
 			}
 		}
+		catch(Exception e){
+			String decode_cols = Arrays.toString(_dcCols);
+			String source_cols = Arrays.toString(_srcCols);
+
+			// LOG.error(Arrays.toString(_dcCols));
+			// LOG.error(Arrays.toString( ))
+			throw new RuntimeException("Failed decoding with decode: " + decode_cols + " and source : " + source_cols,e);
+		}
 	}
 
 	@Override