uschindler commented on code in PR #1034:
URL: https://github.com/apache/lucene/pull/1034#discussion_r923642311


##########
lucene/core/src/java/org/apache/lucene/store/ByteBuffersDataOutput.java:
##########
@@ -309,6 +309,30 @@ public byte[] toArrayCopy() {
     return arr;
   }
 
+  @Override
+  public void copyBytes(DataInput input, long numBytes) throws IOException {
+    assert numBytes >= 0 : "numBytes=" + numBytes;
+    int length = (int) numBytes;
+    while (length > 0) {
+      if (!currentBlock.hasRemaining()) {
+        appendBlock();
+      }
+      if (currentBlock.isDirect()) {

Review Comment:
   this should be `false == currentBlock.hasArray()`
   
   This is because direct and has array are somehow opposites, but thats just 
an implementation details. So whenever a buffer does not have an array we need 
to fallback to the super method.



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