cxzl25 commented on PR #46273:
URL: https://github.com/apache/spark/pull/46273#issuecomment-2088046945
> why we are skipping the tests
Limits after group by are not guaranteed to be in order.
```
[info] == Results ==
[info] !== Correct Answer - 1 == == Spark Answer - 1 ==
[info] struct<id:bigint,count(1):bigint>
struct<id:bigint,count(1):bigint>
[info] ![1,1] [0,1] (QueryTest.scala:267)
[info] org.scalatest.exceptions.TestFailedException:
[info] at
org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:472)
[info] at
org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:471)
[info] at
org.apache.spark.sql.QueryTest$.newAssertionFailedException(QueryTest.scala:257)
[info] at org.scalatest.Assertions.fail(Assertions.scala:933)
[info] at org.scalatest.Assertions.fail$(Assertions.scala:929)
[info] at org.apache.spark.sql.QueryTest$.fail(QueryTest.scala:257)
[info] at org.apache.spark.sql.QueryTest$.checkAnswer(QueryTest.scala:267)
[info] at org.apache.spark.sql.QueryTest.checkAnswer(QueryTest.scala:153)
[info] at
org.apache.spark.sql.execution.adaptive.AdaptiveQueryExecSuite.$anonfun$runAdaptiveAndVerifyResult$1(AdaptiveQueryExecSuite.scala:91)
```
> whether the test is actually testing what we expect
In this added UT check if the final execution plan of AQE contains the limit
operator.
```bash
./bin/spark-sql --conf spark.driver.memory=6g
```
```sql
set spark.sql.shuffle.partitions=16777217;
create table foo as select id from range(2);
select id, count(*) from foo group by id limit 1;
```
```
== Physical Plan ==
AdaptiveSparkPlan (7)
+- == Final Plan ==
LocalTableScan (1)
+- == Initial Plan ==
CollectLimit (6)
+- HashAggregate (5)
+- Exchange (4)
+- HashAggregate (3)
+- Scan hive spark_catalog.default.foo (2)
```
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