Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18494
Unfortunately, the comments in the test cases of `SQLMetricsSuite` are
out-of-dated. Anyway, could you add a test case to `SQLMetricsSuite` for
verifying the logics. Below is an example.
```Scala
test("SortMergeJoin(left-anti) metrics when right table is empty") {
val testDataForJoin = testData2.filter("a < 0") // Empty but not
optimized to EmptyRDD
testDataForJoin.createOrReplaceTempView("testDataForJoin")
withTempView("testDataForJoin") {
val df = spark.sql(
"SELECT * FROM testData2 ANTI JOIN testDataForJoin ON testData2.a =
testDataForJoin.a")
testSparkPlanMetrics(df, 1, Map(
0L -> ("SortMergeJoin", Map(
"number of output rows" -> 6L)))
)
}
}
```
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