andygrove commented on issue #3949:
URL:
https://github.com/apache/datafusion-comet/issues/3949#issuecomment-4262088653
Stack trace:
```
Caused by: java.lang.AssertionError: assertion failed
at scala.Predef$.assert(Predef.scala:208)
at
org.apache.spark.sql.execution.ColumnarToRowExec.<init>(Columnar.scala:70)
```
Spark code:
```scala
case class ColumnarToRowExec(child: SparkPlan) extends
ColumnarToRowTransition with CodegenSupport {
// supportsColumnar requires to be only called on driver side, see also
SPARK-37779.
assert(Utils.isInRunningSparkTask || child.supportsColumnar)
```
somehow there is a mismatch where there is ColumnarToRowExec wrapping a plan
that is not columnar
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