Macro alias masker should consider schema context
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Key: PIG-1999
URL: https://issues.apache.org/jira/browse/PIG-1999
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.9.0
Reporter: Richard Ding
Assignee: Richard Ding
Fix For: 0.9.0
Macro alias masker doesn't consider the current schema context. This results
errors when deciding with alias to mask. Here is an example:
{code}
define toBytearray(in, intermediate) returns e {
a = load '$in' as (name:chararray, age:long, gpa: float);
b = group a by name;
c = foreach b generate a, (1,2,3);
store c into '$intermediate' using BinStorage();
d = load '$intermediate' using BinStorage() as (b:bag{t:tuple(x,y,z)},
t2:tuple(a,b,c));
$e = foreach d generate COUNT(b), t2.a, t2.b, t2.c;
};
f = toBytearray ('data', 'output1');
{code}
Now the alias masker mistakes b in COUNT(b) as an alias instead of b in the
current schema.
The workaround is to not use alias as as names in the schema definition.
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