Yuan Zhang

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According to this article http://www.strictlyuntyped.com/2010/05/tweaking-on-rails-30-3-classattribute.html , should `class_attribute` be used instead of `class_inheritable_accessor` ?

在Linux中,一般用 `TZ` 环境变量设置时区。可以读取这个变量,不存在时再设置默认值? 比如 ```bash TZ=UTC0 date ``` 不过 Spark SQL在某些情况下,也会读取`TZ`? https://spark.apache.org/docs/3.1.1/sql-ref-syntax-aux-conf-mgmt-set-timezone.html