andygrove commented on issue #2749:
URL:
https://github.com/apache/datafusion-comet/issues/2749#issuecomment-3509156717
ExtendedExplainInfo has:
```scala
val tagValue = node.getTagValue(CometExplainInfo.EXTENSION_INFO)
val str = if (tagValue.nonEmpty) {
s" ${node.nodeName} [COMET: ${tagValue.get.mkString(", ")}]"
} else {
node.nodeName
}
```
I think `tagValue` is an empty `Set[String]` in this case. There should be
an additional check for that.
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