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Date: Fri, 23 Dec 2016 19:51:58 +0000 (UTC)
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Subject: [jira] [Commented] (FLINK-5280) Extend TableSource to support
 nested data
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archived-at: Fri, 23 Dec 2016 19:52:00 -0000


    [ https://issues.apache.org/jira/browse/FLINK-5280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15773574#comment-15773574 ] 

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_r93797831
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/TableEnvironment.scala ---
    @@ -340,25 +331,8 @@ abstract class TableEnvironment(val config: TableConfig) {
         * @return A tuple of two arrays holding the field names and corresponding field positions.
         */
       protected[flink] 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
    -      case tpe =>
    -        throw new TableException(s"Type $tpe lacks explicit field naming")
    -    }
    -    val fieldIndexes = fieldNames.indices.toArray
    -
    -    if (fieldNames.contains("*")) {
    -      throw new TableException("Field name can not be '*'.")
    -    }
    -
    -    (fieldNames, fieldIndexes)
    +  (Array[String], Array[Int]) = {
    +    TableEnvironment.getFieldInfo(inputType)
    --- End diff --
    
    It is overridden in a subclass, so I decided to leave this method here and only move the body out of it to make it reusable.


> 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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