alamb commented on code in PR #15743:
URL: https://github.com/apache/datafusion/pull/15743#discussion_r2075226062
##########
datafusion/sql/src/statement.rs:
##########
@@ -710,6 +710,25 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
*statement,
&mut planner_context,
)?;
+
+ //Get inferred data_types from the plan if it is empty in the
prepare statement
+ let data_types = match data_types.is_empty() {
Review Comment:
is there a reason to use a match rather than just if/else?
```suggestion
let data_types = if data_types.is_empty() {
```
...
?
##########
datafusion/sql/src/statement.rs:
##########
@@ -710,6 +710,25 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
*statement,
&mut planner_context,
)?;
+
+ //Get inferred data_types from the plan if it is empty in the
prepare statement
+ let data_types = match data_types.is_empty() {
+ true => {
+ let mut data_types: Vec<DataType> = plan
+ .get_parameter_types()?
+ .iter()
+ .filter_map(|d| match d {
+ (_, Some(v)) => Some(v.clone()),
+ _ => None,
+ })
+ .collect::<Vec<DataType>>();
+ data_types.sort();
+
planner_context.with_prepare_param_data_types(data_types.clone());
+ data_types
+ }
+ false => data_types,
+ };
+
Review Comment:
yes, I agree making the behavior change in a separate PR might be better
Perhaps we could add a method on the `Prepare` struct that would return the
parameter types (or walk over the expressions in the plan calling infer types
if the parameter types are not specified)
https://docs.rs/datafusion/latest/datafusion/logical_expr/struct.Prepare.html#structfield.data_types
So then the test would look like
```rust
#[test]
fn test_infer_types_from_join() {
let sql =
"SELECT id, order_id FROM person JOIN orders ON id = customer_id and
age = $1";
let plan = logical_plan(sql).unwrap();
assert_snapshot!(
plan,
@r#"
Projection: person.id, orders.order_id
Inner Join: Filter: person.id = orders.customer_id AND person.age = $1
TableScan: person
TableScan: orders
"#
);
// NEW: verify the parameter types
let LogicalPlan::Prepare(prepare) = plan else {
panic!("Expected prepare, got {plan:?}");
};
// call new function to create or infer the datatypes
assert_eq!(prepare.get_or_infer_datatypes(), vec![DataType::Int32]);
```
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