[jira] Commented: (HIVE-590) Pass type information in genFileSinkPlan

["Namit Jain (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725347#action_12725347 ] 

Namit Jain commented on HIVE-590:
---------------------------------

This has the following requirements:

1. Pass the type info. in getFileSinkPlan
2. Enhance LazySerde to use json to serialize for complex types under certain conditions
3. Return a new thrift type instead of string from Driver.getSchema()

> Pass type information in genFileSinkPlan
> ----------------------------------------
>
>                 Key: HIVE-590
>                 URL: https://issues.apache.org/jira/browse/HIVE-590
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Raghotham Murthy
>            Assignee: Namit Jain
>
> Right now only column names are being passed between semanticanalyzer and fetchtask. Once type information is passed, we can use LazySerDe to serialize the data (into json) in Driver.getResults().
> Driver.getSchema() should then return a new thrift type ResultSchema instead of String:
> {code}
> struct ResultSchema {
>   // column names, types, comments
>  1: list<hive_metastore.FieldSchema> fieldSchemas,
>  // delimiters etc
>  2: map<string, string> properties
> }
> {code}
> Once this is done, the jdbc client can instantiate a simplified serde from the ResultSchema and parse the query results.

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