andygrove opened a new issue, #2730:
URL: https://github.com/apache/datafusion-comet/issues/2730
### What is the problem the feature request solves?
This code pattern worries me. We should fall back to Spark if we do not know
the timezone.
```
spark/src/main/spark-3.5/org/apache/comet/shims/CometExprShim.scala:
.setTimezone(timeZoneId.getOrElse("UTC"))
spark/src/main/spark-4.0/org/apache/comet/shims/CometExprShim.scala:
.setTimezone(timeZoneId.getOrElse("UTC"))
spark/src/main/scala/org/apache/comet/expressions/CometCast.scala:
castBuilder.setTimezone(timeZoneId.getOrElse("UTC"))
spark/src/main/scala/org/apache/comet/serde/structs.scala:
.setTimezone(expr.timeZoneId.getOrElse("UTC"))
spark/src/main/scala/org/apache/comet/serde/datetime.scala: val
timeZone = expr.timeZoneId.getOrElse("UTC")
spark/src/main/scala/org/apache/comet/serde/datetime.scala: val
timeZone = expr.timeZoneId.getOrElse("UTC")
spark/src/main/scala/org/apache/comet/serde/datetime.scala: val
timeZone = expr.timeZoneId.getOrElse("UTC")
spark/src/main/scala/org/apache/comet/serde/datetime.scala: val
timeZone = expr.timeZoneId.getOrElse("UTC")
```
### Describe the potential solution
_No response_
### Additional context
_No response_
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