[GitHub] [arrow-datafusion] alamb commented on a diff in pull request #2352: Add SQL query planner support for IN subqueries

[GitBox <gi...@apache.org>]

alamb commented on code in PR #2352:
URL: https://github.com/apache/arrow-datafusion/pull/2352#discussion_r860184293


##########
datafusion/core/src/sql/planner.rs:
##########
@@ -4311,4 +4327,41 @@ mod tests {
         );
         quick_test(sql, &expected);
     }
+
+    #[test]
+    fn in_subquery_uncorrelated() {
+        let sql = "SELECT id FROM person p WHERE id IN \
+            (SELECT id FROM person)";
+
+        let subquery_expected = "Subquery: Projection: #person.id\
+        \n  TableScan: person projection=None";
+
+        let expected = format!(
+            "Projection: #p.id\
+            \n  Filter: #p.id IN ({})\
+            \n    SubqueryAlias: p\
+            \n      TableScan: person projection=None",
+            subquery_expected
+        );
+        quick_test(sql, &expected);
+    }
+
+    #[test]

Review Comment:
   👍 



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