beliefer opened a new pull request, #39456:
URL: https://github.com/apache/spark/pull/39456
### What changes were proposed in this pull request?
Currently, the implementation of nth_value for connect is not correct.
```
Traceback (most recent call last):
File
"/Users/s.singh/personal/spark-oss/python/pyspark/sql/tests/test_functions.py",
line 755, in test_nth_value
self.assertEqual(tuple(r), ex[: len(r)])
AssertionError: Tuples differ: ('a', 1, 'x', None) != ('a', 1, 'x', 'x')
First differing element 3:
None
'x'
- ('a', 1, 'x', None)
? ^^^^
+ ('a', 1, 'x', 'x')
?
```
This PR will fix the issue.
### Why are the changes needed?
Try to fix the issue that `nth_value` functions output is not correct.
### Does this PR introduce _any_ user-facing change?
'No'.
New feature.
### How was this patch tested?
Manual tests.
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