andygrove commented on code in PR #1793:
URL: https://github.com/apache/datafusion-comet/pull/1793#discussion_r2109546495
##########
native/core/src/execution/planner.rs:
##########
@@ -956,6 +956,12 @@ impl PhysicalPlanner {
self.create_expr(filter.predicate.as_ref().unwrap(),
child.schema())?;
let filter: Arc<dyn ExecutionPlan> = if
filter.use_datafusion_filter {
+ assert_eq!(
+ scans.len(),
+ 0,
+ "Must not use ScanExec as it may requires a copy"
+ );
+
Review Comment:
My understanding is that we only reuse buffers when using `native_comet` to
read the Parquet files. If `native_iceberg_compat` is used then we will still
have a `ScanExec` reading from JVM but it is safe to use DataFusion's
FilterExec in this case.
@parthchandra would you agree with this?
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