Consider to categorize Operator #3216
Description
Is your feature request related to a problem or challenge? Please describe what you are trying to do.
categorize Operator.
----------- now ------------
Now, we put all operators in one level.
Like following:
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,
.....
}Describe the solution you'd like
----------- want to do ------------
But, in fact, operator are different categories.
we can
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
9.2. Comparison Functions and Operators
....
------- project --------
In specific project
spark:
case class GreaterThan(left: Expression, right: Expression)
extends BinaryComparison presto:
public class ComparisonExpression
extends Expression
{
private final Operator operator;
private final Expression left;
private final Expression right;
}