afs commented on code in PR #2884:
URL: https://github.com/apache/jena/pull/2884#discussion_r1874771525
##########
jena-arq/src/test/java/org/apache/jena/sparql/algebra/TestOpAsQuery.java:
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@@ -482,6 +482,21 @@ public void testMinus02() {
"SELECT * { GRAPH
?g { { ?x ?y ?z FILTER(EXISTS { ?s ?p ?o }) } ?x ?y ?z } }",
syntaxARQ); }
+ @Test
Review Comment:
These EXISTS tests are about the ARQ extensions.
IIRC It's not about EXISTS, it's about subquery select expressions.
If that's right please use this test (insert at around L463):
```java
@Test
public void testSubQuery01() {
test_roundTripQuery("SELECT ?z { SELECT ?x { } }");
}
```
The outer `SELECT ?z` stops the outer `SELECT` getting removed because
`SELECT *` is a no-op.
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