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https://issues.apache.org/jira/browse/PIG-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13714627#comment-13714627
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Cheolsoo Park commented on PIG-3359:
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Great! I just confirmed all unit tests pass now. Thank you!

I have one last suggestion. Can you make this changes?
https://github.com/piaozhexiu/apache-pig/commit/9e7c9ec9b70fa902ad4adc1dcf337762a8a14d3a

While doing more testing, I discovered few more corner cases (see my comments 
on RB) that break your implementation. In addition, I realized that there is no 
need to re-implement the doParamSubstitutionForMacroFile() method after all. So 
I made the above changes to your patch, and your test scripts still work.

Thanks!
                
> Register Statements and Param Substitution in Macros
> ----------------------------------------------------
>
>                 Key: PIG-3359
>                 URL: https://issues.apache.org/jira/browse/PIG-3359
>             Project: Pig
>          Issue Type: Bug
>          Components: parser
>            Reporter: Jonathan Packer
>            Assignee: Jonathan Packer
>         Attachments: PIG-3359_test.tar.gz, PIG-3359-v1.diff, 
> PIG-3359-v2.diff, PIG-3359-v3.diff, PIG-3359-v3-test-failures.txt, 
> PIG-3359-v4.diff
>
>
> There are some gaps in the functionality of macros that I've made a patch to 
> address. The goal is to provide everything you'd need to make reusable 
> algorithms libraries.
> 1. You can't register udfs inside a macro
> 2. Paramater substitutions aren't done inside macros
> 3. Resources (including macros) should not be redundantly acquired if they 
> are already present.
> Rohini's patch https://issues.apache.org/jira/browse/PIG-3204 should address 
> problem 3 where Pig reparses everything every time it reads a line, but there 
> still would be a problem if two separate files import the same macro / udf 
> file.
> To get this working, I moved methods for registering jars/udfs and param 
> substitution from PigServer to PigContext so they can be accessed in 
> QueryParserDriver which processes macros (QPD was already passed a PigContext 
> reference). Is that ok?

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