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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5280) Extend TableSource to support nested data
Date Fri, 23 Dec 2016 12:40:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15772811#comment-15772811
] 

ASF GitHub Bot commented on FLINK-5280:
---------------------------------------

Github user mushketyk commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3039#discussion_r93761407
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/TableEnvironment.scala
---
    @@ -535,4 +509,74 @@ object TableEnvironment {
     
         new ScalaStreamTableEnv(executionEnvironment, tableConfig)
       }
    +
    +  /**
    +    * Returns field names and field positions for a given [[TypeInformation]].
    +    *
    +    * Field names are automatically extracted for
    +    * [[org.apache.flink.api.common.typeutils.CompositeType]].
    +    * The method fails if inputType is not a
    +    * [[org.apache.flink.api.common.typeutils.CompositeType]].
    +    *
    +    * @param inputType The TypeInformation extract the field names and positions from.
    +    * @tparam A The type of the TypeInformation.
    +    * @return A tuple of two arrays holding the field names and corresponding field positions.
    +    */
    +  def getFieldInfo[A](inputType: TypeInformation[A]): (Array[String], Array[Int]) = {
    +    validateType(inputType)
    +
    +    val fieldNames: Array[String] = inputType match {
    +      case t: TupleTypeInfo[A] => t.getFieldNames
    +      case c: CaseClassTypeInfo[A] => c.getFieldNames
    +      case p: PojoTypeInfo[A] => p.getFieldNames
    +      case r: RowTypeInfo => r.getFieldNames
    --- End diff --
    
    Good point, will do that.


> 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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