### Search before asking - [X] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar. ### Motivation Some tables may use SQL keywords as table fields. When executing `MergeInto`, we need to automatically add ` for these fields. ### Solution _No response_ ### Anything else? _No response_ ### Are you willing to submit a PR? - [X] I'm willing to submit a PR!