[
https://issues.apache.org/jira/browse/FLINK-6196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960284#comment-15960284
]
ASF GitHub Bot commented on FLINK-6196:
---------------------------------------
Github user clarkyzl commented on a diff in the pull request:
https://github.com/apache/flink/pull/3623#discussion_r110317256
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/TableFunction.scala
---
@@ -131,8 +129,14 @@ abstract class TableFunction[T] extends
UserDefinedFunction {
* method. Flink's type extraction facilities can handle basic types or
* simple POJOs but might be wrong for more complex, custom, or
composite types.
*
+ * The input arguments are the input arguments which are passed to the
eval() method.
+ * Only the literal arguments (constant values) are passed to the
[[getResultType()]] method.
+ * If non-literal arguments appear, it will pass nulls instead.
+ *
+ * @param arguments arguments of a function call (only literal arguments
+ * are passed, nulls for non-literal ones)
* @return [[TypeInformation]] of result type or null if Flink should
determine the type
*/
- def getResultType: TypeInformation[T] = null
+ def getResultType(arguments: java.util.List[AnyRef]): TypeInformation[T]
= null
--- End diff --
I have updated the pull request and added a `List[TypeInformation[_]`
> Support dynamic schema in Table Function
> ----------------------------------------
>
> Key: FLINK-6196
> URL: https://issues.apache.org/jira/browse/FLINK-6196
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Zhuoluo Yang
> Assignee: Zhuoluo Yang
>
> In many of our use cases. We have to decide the schema of a UDTF at the run
> time. For example. udtf('c1, c2, c3') will generate three columns for a
> lateral view.
> Most systems such as calcite and hive support this feature. However, the
> current implementation of flink didn't implement the feature correctly.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
