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Posted to dev@hive.apache.org by "Navis (JIRA)" <ji...@apache.org> on 2012/12/11 05:43:21 UTC
[jira] [Commented] (HIVE-3753) 'CTAS' and INSERT OVERWRITE send
different column names to the underlying SerDe
[ https://issues.apache.org/jira/browse/HIVE-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528663#comment-13528663 ]
Navis commented on HIVE-3753:
-----------------------------
It does not reproduced in trunk. Could you consider upgrading (v0.10.0, which is not yet released)?
> 'CTAS' and INSERT OVERWRITE send different column names to the underlying SerDe
> -------------------------------------------------------------------------------
>
> Key: HIVE-3753
> URL: https://issues.apache.org/jira/browse/HIVE-3753
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Affects Versions: 0.9.0
> Reporter: Matthew Rathbone
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> A good example is with a JSON serde (https://github.com/rathboma/Hive-JSON-Serde-1)
> Here is a simple example of how the two results differ:
> CREATE TABLE foo ROW FORMAT SERDE '....JsonSerDe' SELECT host from table1;
> generates => {"_col0": "localhost"}
> CREATE TABLE foo(host string) ROW FORMAT SERDE '....JsonSerDe';
> INSERT OVERWRITE TABLE FOO SELECT host FROM table;
> generates => {"host": "localhost"}
> The SerDe gets passed column names in two places:
> 1) The property Constants.LIST_COLUMNS
> 2) It gets passed a StructObjectInspector on serialize
> In the CTAS example above, both of these contain '_col0' as the column name. This is not true in the second example, as the LIST_COLUMNS property contains the real column names.
> I'd be happy to help out with this change, but I fear that the solution lies somewhere in SemanticAnalyser.java, and I'm having a hard time finding my way around.
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