Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/4157#discussion_r125500774
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/queryConfig.scala
---
@@ -37,6 +37,13 @@ class BatchQueryConfig private[table] extends QueryConfig
class StreamQueryConfig private[table] extends QueryConfig {
/**
+ * The non-windowed groupby aggregate update the calculation result
according a configuration of
+ * time interval. By default non-windowed groupby aggregate will update
calculation result each
+ * row.
+ */
+ private var unboundedAggregateUpdateInterval: Time = Time.milliseconds(0)
--- End diff --
I think we need to achieve separately, i.e., proc-time non-windowed
aggregations using `process-time timer.` and event-time non-windowed
aggregations using event-time timer. `updateInterval` also make sense, because
`updateInterval` is relative to the last emit time. i.e., emitTime =
current(Proc/Row)Time+updateInterval. (Calculate emitTime when the data
arrives).
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