[jira] [Created] (SPARK-2106) Unify the HiveContext

["Cheng Hao (JIRA)" <ji...@apache.org>]

Cheng Hao created SPARK-2106:
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             Summary: Unify the HiveContext
                 Key: SPARK-2106
                 URL: https://issues.apache.org/jira/browse/SPARK-2106
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Cheng Hao


I've been working on CLI for Catalyst, and from the CLI point of view, HiveContext may be required some changes as:
- SessionState management
`SessionState` instance creation & initialization should be done within the wrappers, e.g. in `SharkCliDriver` or `CLIService` etc. cause they know better how to load the use configuration and logger output redirection etc. And in HiveContext, it can retrieve SessionState by calling `SessionState.get()`.

- HiveContext API may not be enough for CLI
Retrieving the schema from the output of `SELECT`; but `QueryExecution` is hidden for CLI.
Get each HQL result, besides the string based result, but also we need to know the error code, as well as the call stack if exceptions thrown.



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