safety fix

Baunsgaard · Baunsgaard · commit 4172e6482063 · 2025-01-14T21:05:26.000+01:00
diff --git a/src/main/java/org/apache/sysds/runtime/transform/encode/CompressedEncode.java b/src/main/java/org/apache/sysds/runtime/transform/encode/CompressedEncode.java
@@ -616,7 +616,8 @@ private void combineUncompressed(CompressedMatrixBlock mb) {
 			else
 				ret.add(g);
 		}
-		ret.add(combine(ucg));
+		if(ucg.size() > 0)
+			ret.add(combine(ucg));
 		nnz.addAndGet(ret.get(ret.size()-1).getNumberNonZeros(in.getNumRows()));
 		mb.allocateColGroupList(ret);
 	}

Original file line number	Diff line number	Diff line change
`@@ -616,7 +616,8 @@ private void combineUncompressed(CompressedMatrixBlock mb) {`
`616`	`616`	`else`
`617`	`617`	`ret.add(g);`
`618`	`618`	`}`
`619`		`- ret.add(combine(ucg));`
	`619`	`+ if(ucg.size() > 0)`
	`620`	`+ ret.add(combine(ucg));`
`620`	`621`	`nnz.addAndGet(ret.get(ret.size()-1).getNumberNonZeros(in.getNumRows()));`
`621`	`622`	`mb.allocateColGroupList(ret);`
`622`	`623`	`}`