liukun4515 opened a new issue, #3031:
URL: https://github.com/apache/arrow-datafusion/issues/3031
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
Schema:
```
c1 decimal(18,)
```
select * from table where c1 = 20;
select * from table where c1 in (12,2)
We will get the sql plan like below
```
.....
....
cast(c1 as decimal(20,0), cast(20 as decimal(20,0)
```
The type of `20` or `12,2` is INT64 in the datafusion, the coerced data
type of ` decimal(18,0) compare with int64` is decimal(20,0) according to the
rule `get_comparison_common_decimal_type`.
We need to optimize this point like
[spark-issue](https://issues.apache.org/jira/browse/SPARK-24994), and it will
reduce unnecessary cast/try_cast in many literal case.
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**Describe alternatives you've considered**
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**Additional context**
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