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https://issues.apache.org/jira/browse/BEAM-9418?focusedWorklogId=429253&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-429253
]
ASF GitHub Bot logged work on BEAM-9418:
----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Apr/20 20:47
Start Date: 30/Apr/20 20:47
Worklog Time Spent: 10m
Work Description: jhnmora000 commented on a change in pull request #11333:
URL: https://github.com/apache/beam/pull/11333#discussion_r418279156
##########
File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Sample.java
##########
@@ -246,6 +254,36 @@ private SampleAnyCombineFn(long limit) {
}
}
+ /** A {@link CombineFn} that combines into a single element. */
+ private static class AnyValueCombineFn<T> extends CombineFn<T, List<T>, T> {
+ private SampleAnyCombineFn internal;
+
+ private AnyValueCombineFn() {
+ internal = new SampleAnyCombineFn<>(1);
+ }
+
+ @Override
+ public List<T> createAccumulator() {
+ return internal.createAccumulator();
+ }
+
+ @Override
+ public List<T> addInput(List<T> accumulator, T input) {
+ return internal.addInput(accumulator, input);
+ }
+
+ @Override
+ public List<T> mergeAccumulators(Iterable<List<T>> accumulators) {
+ return internal.mergeAccumulators(accumulators);
+ }
+
+ @Override
+ public T extractOutput(List<T> accumulator) {
+ Iterator<T> it = internal.extractOutput(accumulator).iterator();
+ return it.hasNext() ? it.next() : null;
Review comment:
Yes, I was aware of that. I thought that I could have used java
`Optional<T> `or similar, but I was not sure it would be compliant with other
components. Are there other functions that return optional or nullable objects
in the Java SDK?, I could give them a look.
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Issue Time Tracking
-------------------
Worklog Id: (was: 429253)
Time Spent: 2.5h (was: 2h 20m)
> Support ANY_VALUE aggregation functions
> ---------------------------------------
>
> Key: BEAM-9418
> URL: https://issues.apache.org/jira/browse/BEAM-9418
> Project: Beam
> Issue Type: Task
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: John Mora
> Priority: Major
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> Support the following functionality in BeamSQL:
> {code:java}
> "select t.key, ANY_VALUE(t.column) from t group by t.key";
> {code}
> Spec link:
> https://cloud.google.com/bigquery/docs/reference/standard-sql/aggregate_functions#any_value
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