jackwener opened a new issue, #3216:
URL: https://github.com/apache/arrow-datafusion/issues/3216
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
A clear and concise description of what the problem is. Ex. I'm always
frustrated when [...]
(This section helps Arrow developers understand the context and *why* for
this feature, in addition to the *what*)
**Describe the solution you'd like**
----------- now ------------
Now, we put all operators in one level.
Like following:
```rust
pub enum Operator {
/// Expressions are equal
Eq,
/// Expressions are not equal
NotEq,
/// Left side is smaller than right side
Lt,
/// Left side is smaller or equal to right side
LtEq,
/// Left side is greater than right side
Gt,
.....
}
```
----------- want to do ------------
But, in fact, operator are different categories.
we can
```rust
pub enum ComparisonOp {
Eq,
NotEq,
Lt,
LtEq,
Gt,
GtEq,
}
pub enum Operator {
ComparisonOp(ComparisonOp),
other ...
}
```
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features
you've considered.
**Additional context**
------- pg doc ---------
Like pg expr
[operator](https://www.postgresql.org/docs/current/functions.html)
[9.2. Comparison Functions and
Operators](https://www.postgresql.org/docs/current/functions-comparison.html)
....
------- project --------
In specific project
spark:
```scala
case class GreaterThan(left: Expression, right: Expression)
extends BinaryComparison
```
presto:
```java
public class ComparisonExpression
extends Expression
{
private final Operator operator;
private final Expression left;
private final Expression right;
}
```
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