Mark1626 opened a new pull request, #20460:
URL: https://github.com/apache/datafusion/pull/20460
## Which issue does this PR close?
Closes #5619
## What changes are included in this PR?
1. Introduce a separate accumulator for multi column distinct count
`MultiColumnDistinctCountAccumulator`
2. I used some parts of #5939 for reference, however it was old so I had to
reimplement this
## Are these changes tested?
1. Unit tests have been added
2. I've tested this with a couple of queries in the cli
```
with data AS (
select * from (values
('a', 1, 'x'),
('a', 2, 'x'),
('b', 2, 'y'),
('b', 2, 'z'),
('c', 3, 'z')
) AS t(col1, col2, col3)
)
select count(distinct (col1, col2)) FROM data;
```
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