andygrove commented on a change in pull request #7998:
URL: https://github.com/apache/arrow/pull/7998#discussion_r472562916
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File path: rust/datafusion/src/execution/physical_plan/expressions.rs
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@@ -966,11 +966,32 @@ impl fmt::Display for BinaryExpr {
impl PhysicalExpr for BinaryExpr {
fn data_type(&self, input_schema: &Schema) -> Result<DataType> {
- self.left.data_type(input_schema)
+ Ok(match self.op {
+ Operator::And
+ | Operator::Or
+ | Operator::Not
+ | Operator::NotLike
+ | Operator::Like
+ | Operator::Lt
+ | Operator::LtEq
+ | Operator::Eq
+ | Operator::NotEq
+ | Operator::Gt
+ | Operator::GtEq => DataType::Boolean,
+ Operator::Plus
+ | Operator::Minus
+ | Operator::Multiply
+ | Operator::Divide
+ | Operator::Modulus => {
+ // this assumes that the left and right expressions have
already been co-coerced
+ // to the same type
+ self.left.data_type(input_schema)?
Review comment:
I'm pretty sure this still isn't correct, but is closer than what we had
before.
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