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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5280) Extend TableSource to support nested data
Date Thu, 22 Dec 2016 12:35:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15769949#comment-15769949

Fabian Hueske commented on FLINK-5280:

How about the following:

* We make the {{TableEnvironment.getFieldInfo()}} methods statically accessible, i.e., we
move them in the TableEnvironment companion object and call this method for the default implementation
of {{TableSource.getFieldNames()}} and {{TableSource.getFieldIndicies()}}. This way we avoid
code duplication.

* We remove {{getFieldTypes()}} and {{getNumberOfFields()}}. These methods are in fact not
necessary for the interface. Have a look at how a regular DataSet is converted into a Table.
The field types are extracted in {{FlinkTable}}. {{TableSourceTable}} overrides this logic.
We could simply keep the {{FlinkTable}} logic. 

> Extend TableSource to support nested data
> -----------------------------------------
>                 Key: FLINK-5280
>                 URL: https://issues.apache.org/jira/browse/FLINK-5280
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>    Affects Versions: 1.2.0
>            Reporter: Fabian Hueske
>            Assignee: Ivan Mushketyk
> The {{TableSource}} interface does currently only support the definition of flat rows.

> However, there are several storage formats for nested data that should be supported such
as Avro, Json, Parquet, and Orc. The Table API and SQL can also natively handle nested rows.
> The {{TableSource}} interface and the code to register table sources in Calcite's schema
need to be extended to support nested data.

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