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Extend TestSchedulingUtils with top level union #27080

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Nov 3, 2025
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Extend TestSchedulingUtils with top level union #27080

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28 changes: 28 additions & 0 deletions core/trino-main/src/test/java/io/trino/execution/scheduler/TestSchedulingUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,34 @@ public void testCanStreamNoJoin()
assertThat(SchedulingUtils.canStream(parentSubPlan, valuesSubPlan("a"))).isTrue();
}

@Test
public void testCanStreamUnion()
{
/*
parent(union)
/ \ \
-------------------------------------- stage boundary
a b c
*/
SubPlan aSubPlan = valuesSubPlan("a");
RemoteSourceNode remoteSourceA = remoteSource("a");

SubPlan bSubPlan = valuesSubPlan("b");
RemoteSourceNode remoteSourceB = remoteSource("b");

SubPlan cSubPlan = valuesSubPlan("c");
RemoteSourceNode remoteSourceC = remoteSource("c");

SubPlan parentSubPlan = createSubPlan(
"parent",
union("union", ImmutableList.of(remoteSourceA, remoteSourceB, remoteSourceC)),
ImmutableList.of(aSubPlan, bSubPlan, cSubPlan));

assertThat(SchedulingUtils.canStream(parentSubPlan, aSubPlan)).isTrue();
assertThat(SchedulingUtils.canStream(parentSubPlan, bSubPlan)).isTrue();
assertThat(SchedulingUtils.canStream(parentSubPlan, cSubPlan)).isTrue();
}

@Test
public void testCanStreamJoin()
{
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