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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8868) Support Table Function as Table for Stream Sql
Date Mon, 20 Aug 2018 14:16:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16585993#comment-16585993
] 

ASF GitHub Bot commented on FLINK-8868:
---------------------------------------

Xpray commented on a change in pull request #6574: [FLINK-8868] [table] Support Table Function
as Table Source for Stream Sql
URL: https://github.com/apache/flink/pull/6574#discussion_r211275617
 
 

 ##########
 File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/datastream/DataStreamTableFunctionScanRule.scala
 ##########
 @@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.table.plan.rules.datastream
+
+import org.apache.calcite.plan.RelOptRule
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.convert.ConverterRule
+import org.apache.flink.table.plan.nodes.FlinkConventions
+import org.apache.flink.table.plan.nodes.datastream.DataStreamTableFunctionScan
+import org.apache.flink.table.plan.nodes.logical.FlinkLogicalTableFunctionScan
+
+class DataStreamTableFunctionScanRule
+  extends ConverterRule(
+    classOf[FlinkLogicalTableFunctionScan],
+    FlinkConventions.LOGICAL,
+    FlinkConventions.DATASTREAM,
+    "DataStreamTableFunctionScanRule"
+  ) {
+
+  override def convert(rel: RelNode): RelNode = {
+    val scan: FlinkLogicalTableFunctionScan = rel.asInstanceOf[FlinkLogicalTableFunctionScan]
+    val traitSet = rel.getTraitSet.replace(FlinkConventions.DATASTREAM)
+
+    new DataStreamTableFunctionScan(
 
 Review comment:
   There might be two cases that TableFunction acts like a Source, one is 'Select * from Lateral
Table(udtf())', the other is that the left table do not correlate with the right table so
there's no `LogicalCorrelate ` node.

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> Support Table Function as Table for Stream Sql
> ----------------------------------------------
>
>                 Key: FLINK-8868
>                 URL: https://issues.apache.org/jira/browse/FLINK-8868
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API &amp; SQL
>            Reporter: Ruidong Li
>            Assignee: Ruidong Li
>            Priority: Major
>              Labels: pull-request-available
>
> for stream sql:
> support SQL like:  SELECT * FROM Lateral TABLE(tf("a"))
> for batch sql:
> udtf might produce infinite recors, it need to be discussed



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