dssysolyatin commented on code in PR #3022:
URL: https://github.com/apache/calcite/pull/3022#discussion_r1068114659
##########
core/src/test/java/org/apache/calcite/test/SqlToRelConverterTest.java:
##########
@@ -4769,4 +4769,18 @@ void checkUserDefinedOrderByOver(NullCollation
nullCollation) {
String sql = "SELECT CAST(CAST(? AS INTEGER) AS CHAR)";
sql(sql).ok();
}
+
+ /**
+ * Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-5468";>[CALCITE-5468]
+ * SqlToRelConverter should register sub-queries inside ORDER BY clause
+ * for queries without aggregation</a>.
+ */
+ @Test void testOrderByWithSubQuery() {
+ String sql = "SELECT empno\n"
+ + "FROM emp\n"
+ + "ORDER BY\n"
+ + "CASE WHEN empno IN (1,2) THEN 0 ELSE 1 END";
+ sql(sql).ok();
+ }
Review Comment:
Yes, IN is not subquery in terms of SQL. But inside codebase there are
places with code like:
```
/**
* Scalar expression that represents an IN, EXISTS or scalar sub-query.
*/
public class RexSubQuery extends RexCall
```
It is actually quite confusing.
I renamed test and added test for subquery.
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