abhishekagarwal87 commented on a change in pull request #11809:
URL: https://github.com/apache/druid/pull/11809#discussion_r744937413
##########
File path: processing/src/main/java/org/apache/druid/query/UnionQueryRunner.java
##########
@@ -71,19 +74,23 @@ public UnionQueryRunner(
return new MergeSequence<>(
query.getResultOrdering(),
Sequences.simple(
- Lists.transform(
- unionDataSource.getDataSources(),
- (Function<DataSource, Sequence<T>>) singleSource ->
- baseRunner.run(
- queryPlus.withQuery(
- Queries.withBaseDataSource(query, singleSource)
- // assign the subqueryId. this will be
used to validate that every query servers
- // have responded per subquery in
RetryQueryRunner
- .withDefaultSubQueryId()
- ),
- responseContext
- )
- )
+ IntStream.range(0, unionDataSource.getDataSources().size())
+ .mapToObj(i -> new Pair<>(i + 1,
unionDataSource.getDataSources().get(i)))
+ .map(indexBaseDataSourcePair ->
+ baseRunner.run(
+
queryPlus.withQuery(Queries.withBaseDataSource(
+ query,
+ indexBaseDataSourcePair.rhs
+ ).withSubQueryId(
+ generateSubqueryId(
+ query.getSubQueryId(),
+ // getName() works since the
datasource will be a TableDataSource
+
indexBaseDataSourcePair.rhs.getName(),
+ indexBaseDataSourcePair.lhs
+ )
+ ))
Review comment:
```suggestion
)),
responseContext
```
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