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https://issues.apache.org/jira/browse/FLINK-8577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701652#comment-16701652
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ASF GitHub Bot commented on FLINK-8577:
---------------------------------------
pnowojski commented on a change in pull request #6787: [FLINK-8577][table]
Implement proctime DataStream to Table upsert conversion
URL: https://github.com/apache/flink/pull/6787#discussion_r237018239
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/datastream/DataStreamScanRule.scala
##########
@@ -36,25 +36,32 @@ class DataStreamScanRule
override def matches(call: RelOptRuleCall): Boolean = {
val scan: FlinkLogicalNativeTableScan =
call.rel(0).asInstanceOf[FlinkLogicalNativeTableScan]
- val dataSetTable = scan.getTable.unwrap(classOf[DataStreamTable[Any]])
- dataSetTable match {
- case _: DataStreamTable[Any] =>
- true
- case _ =>
- false
- }
+ val appendTable = scan.getTable.unwrap(classOf[AppendStreamTable[Any]])
+ val upsertTable = scan.getTable.unwrap(classOf[UpsertStreamTable[Any]])
+
+ appendTable != null || upsertTable != null
Review comment:
can we avoid those nulls (in multiple places)? For example by using
`isInstanceOf` or match? Handling null is dangerous and error prone.
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> Implement proctime DataStream to Table upsert conversion.
> ---------------------------------------------------------
>
> Key: FLINK-8577
> URL: https://issues.apache.org/jira/browse/FLINK-8577
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
> Labels: pull-request-available
>
> Api will looks like:
> {code:java}
> DataStream[(String, Long, Int)] input = ???
> // upsert with keyTable
> table = tEnv.upsertFromStream(input, 'a, 'b, 'c.key)
> // upsert without key -> single row tableTable
> table = tEnv.upsertFromStream(input, 'a, 'b, 'c){code}
> A simple design
> [doc|https://docs.google.com/document/d/1yMEi9xkm3pNYNmmZykbLzqtKjFVezaWe0y7Xqd0c1zE/edit?usp=sharing]
> about this subtask.
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