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https://issues.apache.org/jira/browse/PIG-2244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091982#comment-13091982
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Alan Gates commented on PIG-2244:
---------------------------------
Given a script
{code}
define simple_macro(in_relation, min_gpa, max_age) returns c {
b = filter $in_relation by gpa >= $min_gpa and age <= $max_age;
$c = foreach b generate age, name;
}
a = load '/user/pig/tests/data/singlefile/studenttab10k' as (name, age, gpa);
x = simple_macro('a', '3.0', '40');
store x into
'/user/pig/out/hortonal.1314386707/Macro_DefinitionAndInline_4.out';
{code}
(Notice the incorrect quotes around alias a in the invocation of simple_macro.)
This produces
{code}
a = load '/user/pig/tests/data/singlefile/studenttab10k' as (name, age, gpa);
macro_simple_macro_b_0 = filter macro_simple_macro_a_0 BY ((gpa >= 3.0) and
(age <= 40));
x = foreach macro_simple_macro_b_0 generate age, name;
store x INTO
'/user/pig/out/hortonal.1314386707/Macro_DefinitionAndInline_4.out';
{code}
The alias a gets expanded to macro_simple_macro_a.
> Macros cannot be passed relation names
> --------------------------------------
>
> Key: PIG-2244
> URL: https://issues.apache.org/jira/browse/PIG-2244
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.9.0
> Reporter: Alan Gates
> Priority: Minor
>
> If an alias is passed quoted, it gets expanded as if it were an alias in the
> macro, which leads to a very strange error message.
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