beliefer opened a new pull request #29626:
URL: https://github.com/apache/spark/pull/29626
### What changes were proposed in this pull request?
Spark SQL exists a bug show below:
```
spark.sql(
" SELECT COUNT(DISTINCT 2), COUNT(DISTINCT 2, 3)")
.show()
+-----------------+--------------------+
|count(DISTINCT 2)|count(DISTINCT 2, 3)|
+-----------------+--------------------+
| 1| 1|
+-----------------+--------------------+
spark.sql(
" SELECT COUNT(DISTINCT 2), COUNT(DISTINCT 3, 2)")
.show()
+-----------------+--------------------+
|count(DISTINCT 2)|count(DISTINCT 3, 2)|
+-----------------+--------------------+
| 1| 0|
+-----------------+--------------------+
```
The first query is correct, but the second query is not.
The root reason is the first not rewrited by `RewriteDistinctAggregates`.
### Why are the changes needed?
Fix a bug.
`SELECT COUNT(DISTINCT 2), COUNT(DISTINCT 3, 2)` should return 1, 1
### Does this PR introduce _any_ user-facing change?
Yes
### How was this patch tested?
New UT
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