andygrove commented on code in PR #1192:
URL: https://github.com/apache/datafusion-comet/pull/1192#discussion_r1902182688
##########
native/core/src/execution/shuffle/shuffle_writer.rs:
##########
@@ -1567,17 +1585,41 @@ pub fn write_ipc_compressed<W: Write + Seek>(
let mut timer = ipc_time.timer();
let start_pos = output.stream_position()?;
- // write ipc_length placeholder
- output.write_all(&[0u8; 8])?;
+ // seek past ipc_length placeholder
+ output.seek_relative(8)?;
+
+ // write number of columns because JVM side needs to know how many
addresses to allocate
+ let field_count = batch.schema().fields().len();
+ output.write_all(&field_count.to_le_bytes())?;
Review Comment:
This is read in `NativeBatchDecoderIterator`
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