joeyutong commented on code in PR #4088:
URL: https://github.com/apache/calcite/pull/4088#discussion_r1898220178


##########
core/src/test/java/org/apache/calcite/test/RelMetadataTest.java:
##########
@@ -1193,6 +1193,27 @@ private void 
checkColumnUniquenessForFilterWithConstantColumns(String sql) {
         .assertThatUniqueKeysAre(bitSetOf());
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-6727";>[CALCITE-6727]
+   * Column uniqueness constrain should only apply to inner join</a>. */
+  @Test void testColumnUniquenessForLeftJoinOnLimit1() {
+    final String sql = ""
+        + "select A.empno as a_empno,\n"
+        + " A.ename as a_ename,\n"
+        + " B.empno as b_empno,\n"
+        + " B.ename as b_ename\n"

Review Comment:
   I have added the corresponding test. Thanks for you feedback.



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