Fix VerifierTests

Author: jan-elastic

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

@@ -1902,28 +1902,21 @@ public void testIntervalAsString() {
     public void testCategorizeSingleGrouping() {
         assumeTrue("requires Categorize capability", EsqlCapabilities.Cap.CATEGORIZE_V5.isEnabled());
 
-        query("from test | STATS COUNT(*) BY CATEGORIZE(first_name)");
-        query("from test | STATS COUNT(*) BY cat = CATEGORIZE(first_name)");
+        query("FROM test | STATS COUNT(*) BY CATEGORIZE(first_name)");
+        query("FROM test | STATS COUNT(*) BY cat = CATEGORIZE(first_name)");
+        query("FROM test | STATS COUNT(*) BY CATEGORIZE(first_name), emp_no");
+        query("FROM test | STATS COUNT(*) BY a = CATEGORIZE(first_name), b = emp_no");
 
         assertEquals(
-            "1:31: cannot use CATEGORIZE grouping function [CATEGORIZE(first_name)] with multiple groupings",
-            error("from test | STATS COUNT(*) BY CATEGORIZE(first_name), emp_no")
-        );
-        assertEquals(
-            "1:39: cannot use CATEGORIZE grouping function [CATEGORIZE(first_name)] with multiple groupings",
+            "1:39: CATEGORIZE grouping function [CATEGORIZE(first_name)] can only be in the first grouping expression",
             error("FROM test | STATS COUNT(*) BY emp_no, CATEGORIZE(first_name)")
         );
         assertEquals(
-            "1:35: cannot use CATEGORIZE grouping function [CATEGORIZE(first_name)] with multiple groupings",
-            error("FROM test | STATS COUNT(*) BY a = CATEGORIZE(first_name), b = emp_no")
-        );
-        assertEquals(
-            "1:31: cannot use CATEGORIZE grouping function [CATEGORIZE(first_name)] with multiple groupings\n"
-                + "line 1:55: cannot use CATEGORIZE grouping function [CATEGORIZE(last_name)] with multiple groupings",
+            "1:55: CATEGORIZE grouping function [CATEGORIZE(last_name)] can only be in the first grouping expression",
             error("FROM test | STATS COUNT(*) BY CATEGORIZE(first_name), CATEGORIZE(last_name)")
         );
         assertEquals(
-            "1:31: cannot use CATEGORIZE grouping function [CATEGORIZE(first_name)] with multiple groupings",
+            "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)")
         );
     }