zzwqqq commented on code in PR #4748:
URL: https://github.com/apache/calcite/pull/4748#discussion_r2702216942


##########
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java:
##########
@@ -6426,6 +6426,25 @@ private void checkLiteral2(String expression, String 
expected) {
     sql(query).withConfig(c -> c.withExpand(false)).ok(expected);
   }
 
+  /** Test case of
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-7378";>[CALCITE-7378]
+   * Potential incorrect column attribution in RelToSqlConverter due to 
implicit
+   * table alias handling</a>. */
+  @Test void testSubQueryWithSelfJoin() {
+    String query = "select \"product_name\" from \"product\" t1 "
+        + "where \"product_id\" not in (select \"product_id\" "
+        + "from \"product\" t2 "
+        + "where t2.\"product_id\" = t1.\"product_id\" "
+        + "and t1.\"product_id\" = 2 and t2.\"product_id\" = 1)";
+    String expected = "SELECT \"product_name\"\n"

Review Comment:
   @xiedeyantu Thanks for the quite detailed explanation. I have added quidem 
cases.



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