xiedeyantu commented on code in PR #4828:
URL: https://github.com/apache/calcite/pull/4828#discussion_r2930870161


##########
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java:
##########
@@ -11887,6 +11887,39 @@ public Sql schema(CalciteAssert.SchemaSpec schemaSpec) 
{
     sql(sql).schema(CalciteAssert.SchemaSpec.JDBC_SCOTT).ok(expected);
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-7440";>[CALCITE-7440]
+   * RelToSqlConverter throws NPE when correlation scope is missing after
+   * semi-join rewrites.</a>. */
+  @Test void testPostgresqlRoundTripCorrelatedProjectWithSemiJoinRules() {

Review Comment:
   Please take a look at my description; you may not have solved my problem.



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