TsReaper commented on a change in pull request #11688: [FLINK-16636] Fix
possible NPE in Utils.CollectHelper
URL: https://github.com/apache/flink/pull/11688#discussion_r406637302
##########
File path: flink-java/src/main/java/org/apache/flink/api/java/Utils.java
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@@ -138,6 +138,12 @@ public void writeRecord(T record) throws IOException {
@Override
public void close() {
+ // when the sink is up but not initialized and the job
fails due to other operators,
+ // it is possible that close() is called when open() is
not called,
+ // so we have to do this null check
+ if (accumulator == null) {
+ accumulator = new SerializedListAccumulator<>();
Review comment:
The user of this `CollectHelper` expects this accumulator to appear in the
result. Not adding this accumulator will result in additional checks on the
user side.
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