isidentical commented on code in PR #3868:
URL: https://github.com/apache/arrow-datafusion/pull/3868#discussion_r1000049117
##########
datafusion/expr/src/operator.rs:
##########
@@ -115,6 +115,41 @@ impl Operator {
| Operator::StringConcat => None,
}
}
+
+ /// Return the operator where swapping lhs and rhs wouldn't change the
result.
+ ///
+ /// For example `Binary(50, >=, a)` could also be represented as
`Binary(a, <=, 50)`.
+ pub fn swap(&self) -> Option<Operator> {
+ match self {
+ Operator::Lt => Some(Operator::Gt),
+ Operator::LtEq => Some(Operator::GtEq),
+ Operator::Gt => Some(Operator::Lt),
+ Operator::GtEq => Some(Operator::LtEq),
+ Operator::Eq
Review Comment:
That's true, thanks for the catch!
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