[GitHub] [arrow-datafusion] andygrove commented on a diff in pull request #2402: nested query fix

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

andygrove commented on code in PR #2402:
URL: https://github.com/apache/arrow-datafusion/pull/2402#discussion_r862884307


##########
datafusion/core/tests/sql/expr.rs:
##########
@@ -1127,3 +1129,25 @@ async fn csv_query_sqrt_sqrt() -> Result<()> {
     assert_float_eq(&expected, &actual);
     Ok(())
 }
+
+#[tokio::test]
+async fn nested_subquery() -> Result<()> {
+    let ctx = SessionContext::new();
+    let schema = Schema::new(vec![
+        Field::new("id", DataType::Int16, false),
+        Field::new("a", DataType::Int16, false),
+    ]);
+    let empty_table = Arc::new(EmptyTable::new(Arc::new(schema)));
+    ctx.register_table("t1", empty_table.clone())?;
+    ctx.register_table("t2", empty_table)?;
+    let sql = "SELECT COUNT(*) as cnt \
+    FROM (\
+        (SELECT id FROM t1) EXCEPT \
+        (SELECT id FROM t2)\
+        ) foo";
+    let actual = execute_to_batches(&ctx, sql).await;
+    // the purpose of this test is just to make sure the query produces a valid plan

Review Comment:
   I think this comment can be removed since the test actually is executing and producing the correct result?



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