Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3958#discussion_r117724493
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/StreamTableEnvironment.scala
---
@@ -629,8 +629,7 @@ abstract class StreamTableEnvironment(
// if no change flags are requested, verify table is an insert-only
(append-only) table.
if (!withChangeFlag && !isAppendOnly(logicalPlan)) {
throw new TableException(
- "Table is not an append-only table. " +
- "Output needs to handle update and delete changes.")
+ "Table is not an append-only table. Try calling the
[table.toRetractStream] method.")
--- End diff --
I don't think that "try calling..." is a helpful message. What about "Table
is not an append-only table. Use the toRetractStream() in order to handle add
and retract messages."?
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