[jira] [Commented] (ORC-562) Don't wrap readerSchema in acidSchema, if readerSchema is already acid

["Laszlo Pinter (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ORC-562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16958695#comment-16958695 ] 

Laszlo Pinter commented on ORC-562:
-----------------------------------

[~omalley] Could you please review/commit this change? Also, I cannot assign this Jira to myself. Thanks

> Don't wrap readerSchema in acidSchema, if readerSchema is already acid
> ----------------------------------------------------------------------
>
>                 Key: ORC-562
>                 URL: https://issues.apache.org/jira/browse/ORC-562
>             Project: ORC
>          Issue Type: Bug
>          Components: Java
>    Affects Versions: 1.5.6, 1.6.0
>            Reporter: Laszlo Pinter
>            Priority: Major
>         Attachments: ORC-562.01.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> {code:sql}
> create table tbl1 (a int, b string) partitioned by (ds string) stored as orc tblproperties ('transactional'='true');
> insert into tbl1 partition (ds) values (1, 'fred', 'today'), (2, 'wilma', 'yesterday');
> {code}
> As this table is transactional, all the modifications will generate a new delta directory, containing a delta file in orc format. The schema of this file will be
> {code:sql}
> struct<operation:int,originaltransaction:bigint,bucket:int,rowid:bigint,currenttransaction:bigint,row:struct<a:int,b:string>>
> {code}
> If I create a new partitioned table with the very same schema, and change the partition location to one of the delta directories, I would assume that I would be able to run queries against the contents of the delta file. 
> Right now this is not possible in orc, because the original readerschema is wrapped in acidschema again, regardless that the readerschema is already acid.
> {code:sql}
> struct<operation:int,originalTransaction:bigint,bucket:int,rowId:bigint,currentTransaction:bigint,row:struct<operation:int,originaltransaction:bigint,bucket:int,rowid:bigint,currenttransaction:bigint,row:struct<a:int,b:string>>>
> {code}



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