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https://issues.apache.org/jira/browse/PIG-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150153#comment-13150153
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xuting zhao commented on PIG-2184:
----------------------------------
I use the method which adds "\\" in front of the dollar variable. If we call
the Matcher.quoteReplacement(val) function in PreprocessorContext.java, it will
be too general and as a result, there will be some problem in parameter
substitution. For example, '\' will be added in front of URL parameters.
Ant test-commit has been run successfully and a new Junit test has been added
into the test/org/apache/pig/test/TestMacroExpansion.java. The old Junit test
of PIG-2081 has been removed because it is about adding error message under
this situation
> Not able to provide positional reference to macro invocations
> -------------------------------------------------------------
>
> Key: PIG-2184
> URL: https://issues.apache.org/jira/browse/PIG-2184
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Vivek Padmanabhan
> Assignee: xuting zhao
> Fix For: 0.10
>
> Attachments: 2184.patch
>
>
> It looks like the macro functionality doesnt support for positional
> references. The below is an example script;
> ----------------------------------------------------------------------------
> DEFINE my_macro (X,key) returns Y
> {
> tmp1 = foreach $X generate TOKENIZE((chararray)$key) as tokens;
> tmp2 = foreach tmp1 generate flatten(tokens);
> tmp3 = order tmp2 by $0;
> $Y = distinct tmp3;
> }
> A = load 'sometext' using TextLoader() as (row1) ;
> E = my_macro(A,A.$0);
> dump E;
> ----------------------------------------------------------------------------
> This script execution fails at parsing staging itself;
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during
> parsing. <file try1.pig, line 16,
> column 16> mismatched input '.' expecting RIGHT_PAREN
> If i replace A.$0 with the field name ie row1 the script runs fine.
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