zhengruifeng opened a new pull request, #39622:
URL: https://github.com/apache/spark/pull/39622
### What changes were proposed in this pull request?
Fix `count(*)` and `count(expr(*))`
### Why are the changes needed?
1, `count(*)` doesn't work:
```
pyspark.sql.connect.client.SparkConnectAnalysisException:
[UNRESOLVED_COLUMN.WITH_SUGGESTION] A column or function parameter with name
`*` cannot be resolved. Did you mean one of the following? [`alphabets`]
Plan: 'Aggregate [unresolvedalias('count('*), None), count(alphabets#32) AS
count(alphabets)#35L]
+- Project [alphabets#30 AS alphabets#32]
+- LocalRelation [alphabets#30]
```
2, `count(expr(*))` outputs different column name and **incorrect** number
```
Failed example:
df.select(count(expr("*")), count(df.alphabets)).show()
Expected:
+--------+----------------+
|count(1)|count(alphabets)|
+--------+----------------+
| 4| 3|
+--------+----------------+
Got:
+----------------+----------------+
|count(alphabets)|count(alphabets)|
+----------------+----------------+
| 3| 3|
+----------------+----------------+
<BLANKLINE>
```
### Does this PR introduce _any_ user-facing change?
yes
### How was this patch tested?
enabled UT and added UT
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