Add test with alias reuse and grouping (#60396) (#60421)

Add test with alias reuse and grouping.

(cherry picked from commit 37ee819)

Author: bpintea

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/analysis/analyzer/VerifierErrorMessagesTests.java

@@ -633,6 +633,11 @@ public void testGroupByOrderByScore() {
                 error("SELECT int FROM test GROUP BY int ORDER BY SCORE()"));
     }
 
+    public void testGroupByWithRepeatedAliases() {
+        accept("SELECT int as x, keyword as x, max(date) as a FROM test GROUP BY 1, 2");
+        accept("SELECT int as x, keyword as x, max(date) as a FROM test GROUP BY int, keyword");
+    }
+
     public void testHavingOnColumn() {
         assertEquals("1:42: Cannot use HAVING filter on non-aggregate [int]; use WHERE instead",
                 error("SELECT int FROM test GROUP BY int HAVING int > 2"));