kczimm opened a new issue, #15979:
URL: https://github.com/apache/datafusion/issues/15979
### Describe the bug
Parameterized queries with placeholders before `IN <subquery>` are not
inferred. For example,
```sql
SELECT * FROM my_table WHERE $1 IN (SELECT A FROM my_table WHERE B > 3);
```
### To Reproduce
```rust
// Schema for my_table: A (Int32), B (Int32)
let schema = Arc::new(Schema::new(vec![
Field::new("A", DataType::Int32, true),
Field::new("B", DataType::Int32, true),
]));
let source = Arc::new(LogicalTableSource::new(schema.clone()));
// SELECT * FROM my_table WHERE $1 IN (SELECT A FROM my_table WHERE B > 3);
let placeholder = Expr::Placeholder(Placeholder {
id: "$1".to_string(),
data_type: None,
});
// Subquery: SELECT A FROM my_table WHERE B > 3
let subquery_filter = Expr::BinaryExpr(BinaryExpr {
left: Box::new(col("B")),
op: Operator::Gt,
right: Box::new(Expr::Literal(ScalarValue::Int32(Some(3)))),
});
let subquery_scan = LogicalPlan::TableScan(TableScan {
table_name: TableReference::from("my_table"),
source,
projected_schema: Arc::new(DFSchema::try_from(schema.clone())?),
projection: None,
filters: vec![subquery_filter.clone()],
fetch: None,
});
let projected_fields = vec![Field::new("A", DataType::Int32, true)];
let projected_schema = Arc::new(DFSchema::from_unqualified_fields(
projected_fields.into(),
Default::default(),
)?);
let subquery = Subquery {
subquery: Arc::new(LogicalPlan::Projection(Projection {
expr: vec![col("A")],
input: Arc::new(subquery_scan),
schema: projected_schema,
})),
outer_ref_columns: vec![],
};
let in_subquery = Expr::InSubquery(InSubquery {
expr: Box::new(placeholder),
subquery,
negated: false,
});
let df_schema = DFSchema::try_from(schema)?;
let (inferred_expr, contains_placeholder) =
in_subquery.infer_placeholder_types(&df_schema)?;
assert!(
contains_placeholder,
"Expression should contain a placeholder"
);
match inferred_expr {
Expr::InSubquery(in_subquery) => match *in_subquery.expr {
Expr::Placeholder(placeholder) => {
assert_eq!(
placeholder.data_type,
Some(DataType::Int32),
"Placeholder $1 should infer Int32"
);
}
_ => panic!("Expected Placeholder expression in InSubquery"),
},
_ => panic!("Expected InSubquery expression"),
}
```
```shell
assertion `left == right` failed: Placeholder $1 should infer Int32
left: None
right: Some(Int32)
```
### Expected behavior
Assertions pass.
### Additional context
_No response_
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