Eric Gaudet updated PIG-704:

    Attachment: aliases_last.patch

Add the following features:

1) new command "aliases" that prints the list of defined aliases.

2) allows the identifiers to start with "_", and used the one-character string 
"_" as a short cut for the last created alias in the the command "describe".

- "_" was not added as the first character of an identifier to the query parser 
in this patch. 
- the _ shortcut was only implemented for describe, not for dump.

> Interactive mode doesn't list defined aliases
> ---------------------------------------------
>                 Key: PIG-704
>                 URL: https://issues.apache.org/jira/browse/PIG-704
>             Project: Pig
>          Issue Type: Improvement
>          Components: grunt
>            Reporter: Eric Gaudet
>            Priority: Trivial
>         Attachments: aliases_last.patch
> I'm using the interactive mode to test my scripts, and I'm struggling to keep 
> track of 2 things:
> 1) the aliases. A typical test script has 10 aliases or more. As the test 
> goes on, different versions are created, or aliases are created with typos. 
> There's no command in grunt to get the list of defined aliases. Proposed 
> solution: add a new command "aliases" that prints the list of aliases.
> 2) I prefer to give meaningful (long) names to my aliases. But as I try 
> different things, I find it hard to predict what the schema will look like, 
> so I use DESCRIBE a lot. It's a pain to type these long names all the time, 
> especially since most of the time I only want to describe the last alias 
> created. A shortcut to the describe command describing the last alias will be 
> very useful. Proposed solution: use the special name "_" as a shortcut to the 
> last created alias: DECRIBE _.

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