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https://issues.apache.org/jira/browse/PIG-5110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16301505#comment-16301505
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Michael Bush commented on PIG-5110:
-----------------------------------
Great patch!
I've found a scenario where it doesn't disambiguate. See the following:
{code}
set pig.store.schema.disambiguate false
A = load 'data1' as (a, b);
B = load 'data1' as (c, d);
C = join A by a, B by c;
describe C;
{code}
Joins work fine and the prefix is removed.
{noformat}
C: {a: bytearray,b: bytearray,c: bytearray,d: bytearray}
{noformat}
However, when there is a group the prefix is not removed. Continuing from
above:
{code}
D = group C by a;
E = load 'data1' as (e, f);
F = join E by e, D by group;
describe F;
{code}
{noformat}
F: {e: bytearray,f: bytearray,group: bytearray,C: {(A::a: bytearray,A::b:
bytearray,B::c: bytearray,B::d: bytearray)}}
{noformat}
Notice it didn't remove the prefix inside of the grouped data C:
So when I use JsonStorage, it leaves the prefixes which is undesirable.
> Removing schema alias and :: coming from parent relation
> --------------------------------------------------------
>
> Key: PIG-5110
> URL: https://issues.apache.org/jira/browse/PIG-5110
> Project: Pig
> Issue Type: New Feature
> Reporter: Adam Szita
> Assignee: Adam Szita
> Fix For: 0.17.0
>
> Attachments: PIG-5110.0.patch, PIG-5110.1.patch, PIG-5110.2.patch
>
>
> Customers have asked for a feature to get rid of the schema alias prefixes.
> CROSS, JOIN, FLATTEN, etc.. prepend the field name with the parent field
> alias and ::
> I would like to find a way to disable this feature. (The burden of making
> sure not to have duplicate aliases - and hence the appropriate
> FrontendException getting thrown - is on the user)
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