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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/01/11 12:15:22 UTC
[GitHub] [beam] je-ik opened a new pull request #13719: [BEAM-10402] Trigger#subTriggers might return null
je-ik opened a new pull request #13719:
URL: https://github.com/apache/beam/pull/13719
Trigger#subTriggers() might return null (e.g. AfterProcessingTime).
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[GitHub] [beam] je-ik merged pull request #13719: [BEAM-10402] Trigger#subTriggers might return null
Posted by GitBox <gi...@apache.org>.
je-ik merged pull request #13719:
URL: https://github.com/apache/beam/pull/13719
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[GitHub] [beam] kennknowles commented on pull request #13719: [BEAM-10402] Trigger#subTriggers might return null
Posted by GitBox <gi...@apache.org>.
kennknowles commented on pull request #13719:
URL: https://github.com/apache/beam/pull/13719#issuecomment-758159988
Can we just make it return an empty list? Is there any value to using null?
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[GitHub] [beam] je-ik commented on pull request #13719: [BEAM-10402] Trigger#subTriggers might return null
Posted by GitBox <gi...@apache.org>.
je-ik commented on pull request #13719:
URL: https://github.com/apache/beam/pull/13719#issuecomment-758172396
None that I'm aware of. I was just trying to legalize the current state. I changed the fix not to return null, which is really probably better, as it seems there is code that could throw NPE when subTriggers() return null.
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[GitHub] [beam] kennknowles commented on a change in pull request #13719: [BEAM-10402] Trigger#subTriggers might return null
Posted by GitBox <gi...@apache.org>.
kennknowles commented on a change in pull request #13719:
URL: https://github.com/apache/beam/pull/13719#discussion_r555313479
##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/windowing/Trigger.java
##########
@@ -87,7 +88,7 @@ protected Trigger() {
}
public List<Trigger> subTriggers() {
- return subTriggers;
+ return MoreObjects.firstNonNull(subTriggers, Collections.emptyList());
Review comment:
I think also we could enable nullness checking on the subclasses and discover that the field should never be null. Anyhow this fix makes the API null-safe so looks good even though I think it can go further.
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[GitHub] [beam] je-ik commented on a change in pull request #13719: [BEAM-10402] Trigger#subTriggers might return null
Posted by GitBox <gi...@apache.org>.
je-ik commented on a change in pull request #13719:
URL: https://github.com/apache/beam/pull/13719#discussion_r555317940
##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/windowing/Trigger.java
##########
@@ -87,7 +88,7 @@ protected Trigger() {
}
public List<Trigger> subTriggers() {
- return subTriggers;
+ return MoreObjects.firstNonNull(subTriggers, Collections.emptyList());
Review comment:
I agree that it is questionable why the field should ever be null. On the other hand, the code seems to distinguish cases when the field is null and when the list is empty. This might be fixed later with other nullness related fixes.
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