a9077299d7
### What changes were proposed in this pull request?
Add distinct info at `UnresolvedFunction.toString`.
### Why are the changes needed?
Make `UnresolvedFunction` info complete.
```
create table test (c1 int, c2 int);
explain extended select sum(distinct c1) from test;
-- before this pr
== Parsed Logical Plan ==
'Project [unresolvedalias('sum('c1), None)]
+- 'UnresolvedRelation [test]
-- after this pr
== Parsed Logical Plan ==
'Project [unresolvedalias('sum(distinct 'c1), None)]
+- 'UnresolvedRelation [test]
```
### Does this PR introduce _any_ user-facing change?
Yes, get distinct info during sql parse.
### How was this patch tested?
manual test.
Closes #29586 from ulysses-you/SPARK-32743.
Authored-by: ulysses <youxiduo@weidian.com>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
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