LuciferYang opened a new pull request, #36393:
URL: https://github.com/apache/spark/pull/36393
### What changes were proposed in this pull request?
This is pr use `Collections.singletonList` instead of `Arrays.asList` when
there is only one argument.
**Before**
```
List<String> one = Arrays.asList("one");
```
**After**
```
List<String> one = Collections.singletonList("one");
```
### Why are the changes needed?
A minor optimization will save a little memory due to `Arrays.asList` will
create an `E[]` but `Collections.SingletonList` not.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Pass GA
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