[jira] [Resolved] (PIG-5399) OrcStorage dropping Tuple(struct) schema when Tuple only has one field

["Koji Noguchi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-5399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Koji Noguchi resolved PIG-5399.
-------------------------------
    Resolution: Duplicate

I don't remember myself but I think this was a duplicate of PIG-5400. 

> OrcStorage dropping Tuple(struct) schema when Tuple only has one field
> ----------------------------------------------------------------------
>
>                 Key: PIG-5399
>                 URL: https://issues.apache.org/jira/browse/PIG-5399
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>            Priority: Minor
>
> I was asked by a user that they were seeing inconsistent schema when stored on OrcStorage.
> Sample code
> {code}
> A = load 'input.txt' as (a0:long);
> B = GROUP A by a0;
> STORE B into 'filename' using OrcStorage();
> {code}
> Pig's schema
> {{B: {group: long,A: bag: { tuple(a0: long)}}}}.
> Expected Orc schema
> {{struct<group:bigint,A:array<struct<bigint>>>}}
> Actual Orc schema
> {{struct<group:bigint,A:array<bigint>>}}
> _This only happens when a tuple contain a single item._
> Current schema without struct(tuple) is better in saving space but it would be nice to have an option to keep the extra struct(tuple) layer if user expects schema evolution within that tuple by adding more fields in the future.



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