Two more verifier tests

Author: jan-elastic

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java

@@ -1912,6 +1912,14 @@ public void testCategorizeOnlyFirstGrouping() {
             "1:55: CATEGORIZE grouping function [CATEGORIZE(first_name)] can only be in the first grouping expression",
             error("FROM test | STATS COUNT(*) BY CATEGORIZE(first_name), CATEGORIZE(first_name)")
         );
+        assertEquals(
+            "1:63: CATEGORIZE grouping function [CATEGORIZE(last_name)] can only be in the first grouping expression",
+            error("FROM test | STATS COUNT(*) BY CATEGORIZE(first_name), emp_no, CATEGORIZE(last_name)")
+        );
+        assertEquals(
+            "1:63: CATEGORIZE grouping function [CATEGORIZE(first_name)] can only be in the first grouping expression",
+            error("FROM test | STATS COUNT(*) BY CATEGORIZE(first_name), emp_no, CATEGORIZE(first_name)")
+        );
     }
 
     public void testCategorizeNestedGrouping() {