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https://issues.apache.org/jira/browse/HIVE-1003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134344#comment-13134344
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He Yongqiang commented on HIVE-1003:
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1) move the optimizer to physical optimizer.
2) after 1), changes in GenMapRedUtils also need to be moved.
3) add a testcase which uses CombineHiveInputFormat.
4) also test virtual_column.q
nitpicks:
1) getCategory() in NullStructSerDe's getObjectInspector should return Struct
2) remove import of "HiveNullValueSequenceFileOutputFormat" and
"OneNullRowInputFormat" from SemanticAnalyzer.java
> optimize metadata only queries
> ------------------------------
>
> Key: HIVE-1003
> URL: https://issues.apache.org/jira/browse/HIVE-1003
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Marcin Kurczych
> Attachments: HIVE-1003.1.patch, hive.1003.2.patch, hive.1003.3.patch
>
>
> Queries like:
> select max(ds) from T
> where ds is a partitioning column should be optimized.
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