本教程还展示如何使用标量函数从date列计算和提取信息，例如星期几和月份。

This tutorial also shows how to use scalar functions to calculate and extract date information, such as day of week and month name, from date columns.

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下面的代码并没有什么特别之处， 只是我们要循环遍历月份名称，而不是只向构造函数传递一个 Map 。

There's nothing special in the following code, just that we're looping through the month names, instead of just passing in a Map to the constructor.

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函数的作用是：返回月份的名字。

The JDMonthName function returns a month name.

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