morrySnow d88caca44a
[fix](Nereids) push down topn distinct through join by mistake ( #31396 ) ...
should not push down topn distinct through join when the output
columns of the corresponding child of join is more than
aggregate distinct columns.
for example for LEFT_OUTER_JOIN:
left child of join's output is: c1, c2, c3.
distinct columns is: c1, c2
topn: limit 2
if we push down topn distinct, we could get result of join like this:
```
c1 c2 c3, ...
1 2 1
1 2 2
```
and the final result we get is:
```
c1 c2
1 2
```
this is wrong, because we need 2 lines, but only return 1.
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