在 Generate 语句中格式化日期 [英] Formatting Date in Generate Statement

问题描述

在 Pig 中，我有一个语句，它基本上将日期附加到我生成的值中.

In Pig, I have a statement which basically appends the date to my generated values.

Data = FOREACH Input GENERATE (CurrentTime()),FLATTEN(group), COUNT(guid)oas Cnt;

输出为我提供了 ISO8601 中的日期 2013-05-25T09:01:38.914-04:00.

The output gives me the date 2013-05-25T09:01:38.914-04:00 in ISO8601.

我怎样才能像 "YYYY-MM-DD" 一样做到这一点?

How can I make this just as "YYYY-MM-DD" ?

推荐答案

您有几个选择:

You have several options:

用 Pig 函数转换它:
例如:

Convert it with Pig functions :
E.g:

A = load ...
B = foreach A {
  currTime = CurrentTime();
  year = (chararray)GetYear(currTime);
  month = (chararray)GetMonth(currTime);
  day = (chararray)GetDay(currTime);
  generate CONCAT(CONCAT(CONCAT(year, '-'), CONCAT(month, '-')),day) as myDate;
}

OR 将日期作为参数传递给脚本:

OR pass the date to the script as a parameter:

pig -f script.pig -param CURR_DATE=`date +%Y-%m-%d`

或在脚本中声明:

%declare CURR_DATE `date +%Y-%m-%d`;

然后在脚本中将变量引用为 '$CURR_DATE'.

Then refer to the variable as '$CURR_DATE' in the script.

您还可以创建一个修改的 CurrentTime UDF，您可以在其中使用 Joda-Time 库.

You may also create a modified CurrentTime UDF in which you convert the DateTime object to the appropriate format with the Joda-Time library.

最简单的方法是在脚本的开头声明日期.

The easiest would be to declare the date in the beginning of the script.

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