Yes, this is just what I'm looking for.
在 2012-7-27，下午5:26， Jonathan Coveney 写道：
> Pig already has this! :)
> Unless I'm really misunderstanding what you mean?
> 2012/7/26 Haitao Yao <[EMAIL PROTECTED]>
>> Hi, all
>> I got an idea about a new feature for pig: define global constants
>> in pig script.
>> Here's the example like this:
>> -- define a global constant for storage
>> define store_location "/where_you_store_result";
>> -- then all the following constants reference will be replaced in runtime
>> store Result into $$store_location using PigStorage(',');
>> so, in this way, we just write the template scripts and import
>> them with the constants defined. A commonly use case is use it to compute
>> data for different days.
>> Without this feature, I have to use sed to replace the variables
>> on the template script to generate the daily pig scripts.
>> How do you guy think so?
>> Haitao Yao
>> [EMAIL PROTECTED]
>> weibo: @haitao_yao
>> Skype: haitao.yao.final