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https://issues.apache.org/jira/browse/HIVE-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506924#comment-13506924
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Matthew Rathbone commented on HIVE-3753:
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We thought of that too, unfortunately it makes no difference, and the same
issue persists.
> '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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