beliefer opened a new pull request, #44184:
URL: https://github.com/apache/spark/pull/44184
### What changes were proposed in this pull request?
Many mainstream databases supports the syntax show below.
**Syntax**:
Aggregate function
`MODE() WITHIN GROUP (ORDER BY sortSpecification)`
Window function
```
MODE() WITHIN GROUP (ORDER BY sortSpecification)
[FILTER (WHERE expression)] [OVER windowNameOrSpecification]
```
**Examples**:
```
SELECT
mode() WITHIN GROUP (ORDER BY v),
mode() WITHIN GROUP (ORDER BY v) FILTER (WHERE k > 0)
FROM aggr;
```
```
SELECT
employee_name,
department,
salary,
mode() WITHIN GROUP (ORDER BY salary) OVER (PARTITION BY department),
mode() WITHIN GROUP (ORDER BY salary) FILTER (WHERE department =
'Accounting') OVER (PARTITION BY department)
FROM basic_pays
ORDER BY salary;
```
### Why are the changes needed?
Support `MODE() WITHIN GROUP (ORDER BY col)`
### Does this PR introduce _any_ user-facing change?
'No'.
New feature.
### How was this patch tested?
New test cases.
### Was this patch authored or co-authored using generative AI tooling?
'No'.
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