sreemanamala commented on code in PR #16658:
URL: https://github.com/apache/druid/pull/16658#discussion_r1749241080
##########
processing/src/main/java/org/apache/druid/query/rowsandcols/RowsAndColumns.java:
##########
@@ -112,4 +131,66 @@ static AppendableRowsAndColumns
expectAppendable(RowsAndColumns input)
*/
@Nullable
<T> T as(Class<T> clazz);
+
+ /**
+ * Serializer for {@link RowsAndColumns} by converting the instance to
{@link FrameRowsAndColumns}
+ */
+ class RowsAndColumnsSerializer extends StdSerializer<RowsAndColumns>
+ {
+ public RowsAndColumnsSerializer()
+ {
+ super(RowsAndColumns.class);
+ }
+
+ @Override
+ public void serialize(
+ RowsAndColumns rac,
+ JsonGenerator jsonGenerator,
+ SerializerProvider serializerProvider
+ ) throws IOException
+ {
+ FrameRowsAndColumns frameRAC = rac.as(FrameRowsAndColumns.class);
+ if (frameRAC == null) {
+ throw DruidException.defensive("Unable to serialize RAC");
+ }
+ JacksonUtils.writeObjectUsingSerializerProvider(jsonGenerator,
serializerProvider, frameRAC.getSignature());
+
+ Frame frame = frameRAC.getFrame();
+ final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ frame.writeTo(
+ Channels.newChannel(baos),
+ false,
+ ByteBuffer.allocate(Frame.compressionBufferSize((int)
frame.numBytes())),
Review Comment:
Since we are not trying to compress, I made the buffer `null`
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