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https://issues.apache.org/jira/browse/PIG-1827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012717#comment-13012717
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Richard Ding commented on PIG-1827:
-----------------------------------

The reason that one has to escape $ in this case is that Pig, by design, allows 
recursive parameter substitution. That is, a parameter value can contain 
another parameter key (prefixed by $). So if the value contains literal $, it 
must be escaped. 

> When passing a parameter to Pig, if the value contains $ it has to be escaped 
> for no apparent reason
> ----------------------------------------------------------------------------------------------------
>
>                 Key: PIG-1827
>                 URL: https://issues.apache.org/jira/browse/PIG-1827
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.8.0
>            Reporter: Julien Le Dem
>


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