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fix: Flaky abort exchange test #11961

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4 changes: 4 additions & 0 deletions velox/exec/tests/MultiFragmentTest.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -512,6 +512,10 @@ TEST_P(MultiFragmentTest, abortMergeExchange) {
// Ensure that the threads in the executor can gracefully join
executor.join();

/* sleep override */
// Wait till all the terminations, closures and destructions are done.
std::this_thread::sleep_for(std::chrono::seconds(1));

// The references to mergeTask should be two, one for the local variable
// itself and one reference inside tasks variable.
EXPECT_EQ(mergeTask.use_count(), 2);
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