Daniel Dai commented on PIG-1042:

We can sub-divide unchecked warnings into several categories:
1. Logical plan related type conversion checking. Logical layer use generics 
extensively and there are places we do not use them consistently. We shall 
address these issues in our logical plan rework. Currently, I simply suppress 
them and put a note on that. We will look back later
2. Backend related type conversion checking. We skip type conversion checking 
intentionally for performance reasons. For these, I will simply suppress them
3. javacc generated warnings. We shall find a way to address them
4. Some valid warnings we shall fix them

>  javac warnings: unchecked
> --------------------------
>                 Key: PIG-1042
>                 URL: https://issues.apache.org/jira/browse/PIG-1042
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.4.0
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
> Pig have 164 javac warnings when you build it with the option 
> "-Dall.warnings=1" which fall into category "unchecked". We need to suppress 
> all of them

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