andygrove commented on code in PR #2402:
URL: https://github.com/apache/arrow-datafusion/pull/2402#discussion_r862913296
##########
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:
Actually, I suppose the comment is valid because we are executing against an
empty batch.
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