plusplusjiajia opened a new pull request, #9214:
URL: https://github.com/apache/paimon/pull/9214
### Purpose
Two `NullPointerException`s on null transform inputs, both reachable today:
* `TrimTransform` reads `charsToTrim` with `toString()` before checking it
for null, so a null second input throws — even though
`StringUtils.ltrim/rtrim`, which it delegates to, already define a null
`charsToTrim` as a null result.
* `StringTransform.toString` maps inputs with `Object::toString` and
throws on a null input, which `ConcatTransform` and `ConcatWsTransform` accept.
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