jorgecarleitao commented on a change in pull request #8032:
URL: https://github.com/apache/arrow/pull/8032#discussion_r482988513
##########
File path: rust/datafusion/src/logical_plan/mod.rs
##########
@@ -1089,6 +1079,15 @@ pub fn can_coerce_from(type_into: &DataType, type_from:
&DataType) -> bool {
}
}
+/// A registry knows how to build logical expressions out of user-defined
function' names
+pub trait Registry {
Review comment:
[Explicit is better than
implicit](https://www.python.org/dev/peps/pep-0020/#id2) (done)
##########
File path: rust/datafusion/src/logical_plan/mod.rs
##########
@@ -1184,19 +1183,14 @@ impl LogicalPlanBuilder {
/// Apply a projection
pub fn project(&self, expr: Vec<Expr>) -> Result<Self> {
let input_schema = self.plan.schema();
- let projected_expr = if expr.contains(&Expr::Wildcard) {
- let mut expr_vec = vec![];
- (0..expr.len()).for_each(|i| match &expr[i] {
- Expr::Wildcard => {
- (0..input_schema.fields().len())
- .for_each(|i|
expr_vec.push(col(input_schema.field(i).name())));
- }
- _ => expr_vec.push(expr[i].clone()),
- });
- expr_vec
- } else {
- expr.clone()
- };
+ let mut projected_expr = vec![];
Review comment:
Indirectly, it is related: `expr.contains(&Expr::Wildcard)` requires
`PartialEq`, which was dropped [in this
line](https://github.com/apache/arrow/pull/8032/files/d2ff9c9b838e68d98d76b1f18c3721f2fa7e411f#diff-9922d86c805a8dc858387eb47612caaeL227)
due to the addition of an `Arc<ScalarFunction>` in [this
line](https://github.com/apache/arrow/pull/8032/files/d2ff9c9b838e68d98d76b1f18c3721f2fa7e411f#diff-9922d86c805a8dc858387eb47612caaeR279).
However, since `if expr.contains(&Expr::Wildcard)` thankfully was entirely
optional, I dropped it ^_^
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