hequn8128 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_r236266595
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File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/StreamTableEnvironment.scala
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@@ -555,18 +555,105 @@ abstract class StreamTableEnvironment(
s"But is: ${execEnv.getStreamTimeCharacteristic}")
}
+ // Can not apply key on append stream
+ if (extractUniqueKeys(fields).nonEmpty) {
+ throw new TableException(
+ s"Can not apply key on append stream, use fromUpsertStream instead.")
Review comment:
Agree, specifing unique key on an AppendTable makes sense. For example, we
only insert data into a table without an update.
Since supporting keys on AppendStream is another new feature. I think we can
add this check now and remove it later if we support keys on AppendStream. The
error message should be corrected as `Apply key on append stream has not been
supported yet! You can use fromUpsertStream instead.`
What do you think?
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