HappenLee opened a new issue #5086:
URL: https://github.com/apache/incubator-doris/issues/5086
**Is your feature request related to a problem? Please describe.**
#### case 1:
Now if we query like
```
select * from test where a in ('a', 'b', 'c') and a is null
```
it is obvious
```
a is null
```
not need push down to Storage Engine. But we **push the conjunct to storage
engine and do filter again in olap_scanner**.
#### case 2:
Now if we query like
```
select * from test where a in ('a', 'b', 'c') and a is not null
```
it is obvious
```
a is not null
```
not need push down to Storage Engine. But we **push the conjunct to storage
engine and do filter again in olap_scanner**.
#### case 3:
Now if we query like
```
select * from test where a is null and a is not null
```
it is obvious an empty result
```
a is not null and a is null
```
But we **push the conjunct to storage engine and do filter again in
olap_scanner**.
**Describe the solution you'd like**
push down the conjunct of 'a is null' and 'a is not null' as other conjuncts
and do not do query when the query is obvious an empty result.
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