comphead commented on issue #2552:
URL:
https://github.com/apache/datafusion-comet/issues/2552#issuecomment-3403642868
Spark has different behavior with nulls
```
scala> spark.sql("select concat('1', '2', null)").show(false)
+------------------+
|concat(1, 2, NULL)|
+------------------+
|NULL |
+------------------+
```
Others
```
D select concat('1', '2', null);
┌────────────────────────┐
│ concat('1', '2', NULL) │
│ varchar │
├────────────────────────┤
│ 12 │
└────────────────────────┘
```
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