Pig should support ability to query unique column name when there is no
ambiguity
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Key: PIG-866
URL: https://issues.apache.org/jira/browse/PIG-866
Project: Pig
Issue Type: Improvement
Components: impl
Affects Versions: 0.4.0
Reporter: Santhosh Srinivasan
Fix For: 0.4.0
Currently, the default alias of a column following a flatten contains the
disambiguator "::". For columns that have a unique name, the "::"
disambiguator is not required. Although, Pig supports column access via the
unique name and the disambiguated name, there is no support to retrieve the
unique column name. This is a nice to have enhancement. An example below will
illustrate the issue:
{code}
grunt> a = load 'input' as (name, age, gpa);
grunt> b = group a ALL;
grunt> c = foreach b generate flatten(a);
grunt> describe c;
c: {a::name: bytearray,a::age: bytearray,a::gpa: bytearray}
grunt> d = foreach c generate name;
grunt> describe d;
d: {a::name: bytearray}
{code}
In the example shown above, although the column name is allowed in the relation
'd', the name of the column appears as 'a::name' in the schema. The workaround
for this issue is to use the AS clause in the foreach. However, this is
cumbersome for users and its something that can be fixed within Pig.
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