alamb commented on code in PR #10445:
URL: https://github.com/apache/datafusion/pull/10445#discussion_r1597133318
##########
datafusion/expr/src/logical_plan/builder.rs:
##########
@@ -188,37 +181,61 @@ impl LogicalPlanBuilder {
n_cols
);
}
- field_types = row
- .iter()
- .enumerate()
- .map(|(j, expr)| {
- if let Expr::Literal(ScalarValue::Null) = expr {
- nulls.push((i, j));
- Ok(field_types[j].clone())
- } else {
- let data_type = expr.get_type(&empty_schema)?;
- if let Some(prev_data_type) = &field_types[j] {
- if prev_data_type != &data_type {
- return plan_err!("Inconsistent data type
across values list at row {i} column {j}. Was {prev_data_type} but found
{data_type}")
+ }
+
+ let empty_schema = DFSchema::empty();
Review Comment:
Another potential location for adding these coercion rules is in
https://github.com/apache/datafusion/blob/main/datafusion/optimizer/src/analyzer/type_coercion.rs
The benefit of putting them there is that it would work for plans created in
ways other than the LogicalPlan builder. We could also potentially coerce types
based on the target table's types rather than just the argument types
themselves 🤔
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