pnowojski commented on a change in pull request #6776: [FLINK-9715][table]
Support temporal join with event time
URL: https://github.com/apache/flink/pull/6776#discussion_r225970725
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/TemporalRowtimeJoin.scala
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@@ -272,24 +264,30 @@ class TemporalRowtimeJoin(
* Binary search `rightRowsSorted` to find the latest right row to join
with `leftTime`.
* Latest means a right row with largest time that is still smaller or
equal to `leftTime`.
*
- * @return index of such element. If such row was not found (either
`rightRowsSorted` is empty
- * or all `rightRowsSorted` are are newer) return -1.
+ * @return found element or `Option.empty` If such row was not found
(either `rightRowsSorted`
+ * is empty or all `rightRowsSorted` are are newer).
*/
- private def latestRightRowToJoin(rightRowsSorted: util.List[Row], leftTime:
Long): Int = {
+ private def latestRightRowToJoin(rightRowsSorted: util.List[Row], leftTime:
Long): Option[Row] = {
Review comment:
`Option` > `NullPointerException` :( Do not use nulls without working
`@Nullable` annotations
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