kbendick commented on a change in pull request #1430:
URL: https://github.com/apache/iceberg/pull/1430#discussion_r487585623
##########
File path: api/src/main/java/org/apache/iceberg/Metrics.java
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@@ -120,4 +124,90 @@ public Long recordCount() {
public Map<Integer, ByteBuffer> upperBounds() {
return upperBounds;
}
+
+ /**
+ * Implemented the method to enable serialization of ByteBuffers.
+ * @param out The stream where to write
+ * @throws IOException On serialization error
+ */
+ private void writeObject(ObjectOutputStream out) throws IOException {
+ out.writeObject(rowCount);
+ out.writeObject(columnSizes);
+ out.writeObject(valueCounts);
+ out.writeObject(nullValueCounts);
+
+ writeByteBufferMap(out, lowerBounds);
+ writeByteBufferMap(out, upperBounds);
+ }
+
+ private static void writeByteBufferMap(ObjectOutputStream out, Map<Integer,
ByteBuffer> byteBufferMap)
+ throws IOException {
+ if (byteBufferMap == null) {
+ out.writeInt(-1);
+
+ } else {
+ // Write the size
+ out.writeInt(byteBufferMap.size());
+
+ for (Map.Entry<Integer, ByteBuffer> entry : byteBufferMap.entrySet()) {
+ // Write the key
+ out.writeObject(entry.getKey());
+
+ // Write the value
+ if (entry.getValue() != null) {
+ // Copy the actual values from the buffer
+ ByteBuffer bb = entry.getValue();
+ byte[] bytes = new byte[bb.remaining()];
+ bb.get(bytes);
+ bb.position(bb.position() - bytes.length); // Restores the buffer
position
Review comment:
We have a `ByteBuffers` util located in the core module at
`org.apache.iceberg.util.ByteBuffers` that handles the appropriate copying and
restoration of ByteBuffers.
Please consider using that for consistency and for easier refactoring of
ByteBuffer issues in the future. Here's a link to that class:
https://github.com/apache/iceberg/blob/master/core/src/main/java/org/apache/iceberg/util/ByteBuffers.java
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