Github user sershe commented on a diff in the pull request:
https://github.com/apache/orc/pull/222#discussion_r173943752
--- Diff: java/core/src/java/org/apache/orc/impl/RecordReaderUtils.java ---
@@ -306,15 +330,24 @@ public void releaseBuffer(ByteBuffer buffer) {
@Override
public DataReader clone() {
+ if (this.file != null) {
+ throw new UnsupportedOperationException(
+ "Cannot clone a DataReader that is already opened");
+ }
try {
- return (DataReader) super.clone();
+ DefaultDataReader clone = (DefaultDataReader) super.clone();
+ // Make sure we don't share the same codec between two readers.
+ clone.codec = OrcCodecPool.getCodec(clone.compressionKind);
--- End diff --
super.clone() is Object.clone(), so no
---
