andygrove commented on issue #2147:
URL:
https://github.com/apache/datafusion-comet/issues/2147#issuecomment-3186142878
So, the `native_iceberg_compat` scan does still create mutable buffers.
```
[info] Cause: org.apache.comet.CometNativeException: oops
[info] at comet::errors::init::{{closure}}(__internal__:0)
[info] at std::panicking::rust_panic_with_hook(__internal__:0)
[info] at
std::panicking::begin_panic_handler::{{closure}}(__internal__:0)
[info] at
std::sys::backtrace::__rust_end_short_backtrace(__internal__:0)
[info] at __rustc::rust_begin_unwind(__internal__:0)
[info] at core::panicking::panic_fmt(__internal__:0)
[info] at
comet::parquet::read::column::TypedColumnReader<T>::new(__internal__:0)
[info] at
comet::parquet::read::column::ColumnReader::get(__internal__:0)
[info] at
Java_org_apache_comet_parquet_Native_initColumnReader(__internal__:0)
[info] at <unknown>(__internal__:0)
[info] at org.apache.comet.parquet.Native.initColumnReader(Native Method)
[info] at org.apache.comet.parquet.Utils.initColumnReader(Utils.java:156)
[info] at
org.apache.comet.parquet.AbstractColumnReader.initNative(AbstractColumnReader.java:127)
[info] at
org.apache.comet.parquet.ConstantColumnReader.<init>(ConstantColumnReader.java:76)
[info] at
org.apache.comet.parquet.ConstantColumnReader.<init>(ConstantColumnReader.java:51)
[info] at
org.apache.comet.parquet.NativeBatchReader.init(NativeBatchReader.java:388)
[info] at
org.apache.comet.parquet.CometParquetFileFormat.$anonfun$buildReaderWithPartitionValues$1(CometParquetFileFormat.scala:169)
[info] at
org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.org$apache$spark$sql$execution$datasources$FileScanRDD$$anon$$readCurrentFile(FileScanRDD.scala:219)
[info] at
org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.nextIterator(FileScanRDD.scala:282)
[info] at
org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.hasNext(FileScanRDD.scala:131)
[info] at
org.apache.spark.sql.comet.CometScanExec$$anon$1.hasNext(CometScanExec.scala:268)
```
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