kczimm commented on code in PR #15980:
URL: https://github.com/apache/datafusion/pull/15980#discussion_r2080056995
##########
datafusion/expr/src/expr.rs:
##########
@@ -1775,6 +1775,27 @@ impl Expr {
| Expr::SimilarTo(Like { expr, pattern, .. }) => {
rewrite_placeholder(pattern.as_mut(), expr.as_ref(),
schema)?;
}
+ Expr::InSubquery(InSubquery {
+ expr,
+ subquery,
+ negated: _,
+ }) => {
+ let subquery_schema = subquery.subquery.schema();
+ let fields = subquery_schema.fields();
+
+ // only supports subquery with exactly 1 field
+ if let [first_field] = &fields[..] {
Review Comment:
The subquery should only return one column.
https://github.com/apache/datafusion/blob/main/datafusion/sql/src/expr/subquery.rs#L120
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