neilconway commented on code in PR #24534:
URL: https://github.com/apache/datafusion/pull/24534#discussion_r3826696130
##########
datafusion/expr/src/expr_schema.rs:
##########
@@ -369,9 +369,8 @@ impl ExprSchemable for Expr {
Ok(expr_nullable | subquery_nullable)
}
- // A scalar subquery may return no rows, in which case it
evaluates to NULL
- // regardless of the nullability of its projected field.
- Expr::ScalarSubquery(_) => Ok(true),
+ Expr::ScalarSubquery(subquery) => Ok(subquery.subquery.min_rows()
== 0
+ || subquery.subquery.schema().field(0).is_nullable()),
Review Comment:
I like it!
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