gianm commented on a change in pull request #10318:
URL: https://github.com/apache/druid/pull/10318#discussion_r477443081
##########
File path: processing/src/main/java/org/apache/druid/query/UnionQueryRunner.java
##########
@@ -41,30 +42,27 @@ public UnionQueryRunner(
public Sequence<T> run(final QueryPlus<T> queryPlus, final ResponseContext
responseContext)
{
Query<T> query = queryPlus.getQuery();
- DataSource dataSource = query.getDataSource();
- if (dataSource instanceof UnionDataSource) {
+
+ final DataSourceAnalysis analysis =
DataSourceAnalysis.forDataSource(query.getDataSource());
+
+ if (analysis.isConcreteTableBased() &&
analysis.getBaseTableDataSources().get().size() != 1) {
Review comment:
Hmm, I was trying to avoid using `instanceof` checks outside of the
DataSourceAnalysis class, and instead stick to cleanly defined interfaces as
much as possible. So, I designed dataSourceAnalysis.getBaseTableDataSources()
to encapsulate this logic (it has the `instanceof` check you're talking about).
Do you think it'd be better to instead move the logic to UnionQueryRunner?
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