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https://issues.apache.org/jira/browse/FLINK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988012#comment-15988012
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ASF GitHub Bot commented on FLINK-6334:
---------------------------------------
Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3791#discussion_r113834406
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/java/StreamTableEnvironment.scala
---
@@ -19,11 +19,12 @@ package org.apache.flink.table.api.java
import org.apache.flink.api.common.typeinfo.TypeInformation
import org.apache.flink.api.java.typeutils.TypeExtractor
-import org.apache.flink.table.api._
-import org.apache.flink.table.functions.TableFunction
-import org.apache.flink.table.expressions.ExpressionParser
import org.apache.flink.streaming.api.datastream.DataStream
import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment
+import org.apache.flink.table.api._
+import org.apache.flink.table.api.scala.TableFunctionConversions
--- End diff --
Please remove the useless import.
> Refactoring UDTF interface
> --------------------------
>
> Key: FLINK-6334
> URL: https://issues.apache.org/jira/browse/FLINK-6334
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Ruidong Li
> Assignee: Ruidong Li
>
> The current UDTF leverages the table.join(expression) interface, which is not
> a proper interface in terms of semantics. We would like to refactor this to
> let UDTF use table.join(table) interface. Very briefly, UDTF's apply method
> will return a Table Type, so Join(UDTF('a, 'b, ...) as 'c) shall be viewed as
> join(Table)
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