dianfu commented on a change in pull request #7209: [FLINK-10977][table] Add
UnBounded FlatAggregate operator to streaming Table API
URL: https://github.com/apache/flink/pull/7209#discussion_r240930180
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File path:
flink-libraries/flink-table-common/src/main/java/org/apache/flink/table/utils/RetractableCollector.java
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@@ -16,21 +16,29 @@
* limitations under the License.
*/
-package org.apache.flink.table.sinks
+package org.apache.flink.table.utils;
-import org.apache.flink.streaming.api.datastream.DataStream
-import org.apache.flink.table.api.Table
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.util.Collector;
/**
- * Defines an external [[TableSink]] to emit streaming [[Table]] with only
insert changes.
- *
- * If the [[Table]] is also modified by update or delete changes, a
- * [[org.apache.flink.table.api.TableException]] will be thrown.
- *
- * @tparam T Type of [[DataStream]] that this [[TableSink]] expects and
supports.
- */
-trait AppendStreamTableSink[T] extends StreamTableSink[T] {
+ * Collects a record and forwards it. The collector can output retract
messages with retract method.
+ * Currently, RetractableCollector is used in TableAggregateFunction.
+ */
+@Internal
+public abstract class RetractableCollector<T> implements Collector<T> {
Review comment:
RetractableCollector can be declared as an interface
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