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https://issues.apache.org/jira/browse/PIG-598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781510#action_12781510
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Thejas M Nair commented on PIG-598:
-----------------------------------
bq. One issue I faced while working on PIG-928 was when trying to name
variables in ruby bound to java variables.
Ashutosh,
You can use "\" to escape parameter substitution . Use 'return
\$input.split();' instead of 'return $input.split();' . After parameter
substitution, it becomes 'return $input.split();' .
> Parameter substitution ($PARAMETER) should not be performed in comments
> -----------------------------------------------------------------------
>
> Key: PIG-598
> URL: https://issues.apache.org/jira/browse/PIG-598
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.2.0
> Reporter: David Ciemiewicz
> Assignee: Thejas M Nair
> Attachments: PIG-598.patch
>
>
> Compiling the following code example will generate an error that
> $NOT_A_PARAMETER is an Undefined Parameter.
> This is problematic as sometimes you want to comment out parts of your code,
> including parameters so that you don't have to define them.
> This I think it would be really good if parameter substitution was not
> performed in comments.
> {code}
> -- $NOT_A_PARAMETER
> {code}
> {code}
> -bash-3.00$ pig -exectype local -latest comment.pig
> USING: /grid/0/gs/pig/current
> java.lang.RuntimeException: Undefined parameter : NOT_A_PARAMETER
> at
> org.apache.pig.tools.parameters.PreprocessorContext.substitute(PreprocessorContext.java:221)
> at
> org.apache.pig.tools.parameters.ParameterSubstitutionPreprocessor.parsePigFile(ParameterSubstitutionPreprocessor.java:106)
> at
> org.apache.pig.tools.parameters.ParameterSubstitutionPreprocessor.genSubstitutedFile(ParameterSubstitutionPreprocessor.java:86)
> at org.apache.pig.Main.runParamPreprocessor(Main.java:394)
> at org.apache.pig.Main.main(Main.java:296)
> {code}
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