clarify the message when filesort is aborted by LIMIT ROWS EXAMINED

Author: vuvova

mysql-test/main/information_schema.result

@@ -2240,7 +2240,7 @@ drop database dummy;
 USE test;
 CREATE VIEW v AS SELECT table_schema  AS object_schema, table_name  AS object_name, table_type AS object_type FROM information_schema.tables ORDER BY object_schema;
 SELECT * FROM v LIMIT ROWS EXAMINED 9;
-ERROR HY000: Sort aborted: 
+ERROR HY000: Sort aborted: LIMIT ROWS EXAMINED
 DROP VIEW v;
 #
 # MDEV-23408 Wrong result upon query from I_S and further Assertion `!alias_arg || strlen(alias_arg->str) == alias_arg->length' failed with certain connection charset

mysql-test/main/limit_rows_examined.result

@@ -608,7 +608,7 @@ select c1, c2 from t3 order by c2, c1 LIMIT ROWS EXAMINED 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	5	Using filesort
 select c1, c2 from t3 order by c2, c1 LIMIT ROWS EXAMINED 2;
-ERROR HY000: Sort aborted: 
+ERROR HY000: Sort aborted: LIMIT ROWS EXAMINED
 explain
 select c1, c2 from t3i order by c2, c1 LIMIT ROWS EXAMINED 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -624,7 +624,7 @@ select c1, c2 from t3i order by c2, c1 desc LIMIT ROWS EXAMINED 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t3i	index	NULL	it3j	8	NULL	5	Using index; Using filesort
 select c1, c2 from t3i order by c2, c1 desc LIMIT ROWS EXAMINED 2;
-ERROR HY000: Sort aborted: 
+ERROR HY000: Sort aborted: LIMIT ROWS EXAMINED
 drop table t3,t3i;
 =========================================================================
 INSERT/DELETE/UPDATE

sql/filesort.cc

@@ -474,7 +474,7 @@ SORT_INFO *filesort(THD *thd, TABLE *table, Filesort *filesort,
                     MYF(0),
                     ER_THD(thd, ER_FILSORT_ABORT),
                     kill_errno ? ER_THD(thd, kill_errno) :
-                    thd->killed == ABORT_QUERY ? "" :
+                    thd->killed == ABORT_QUERY ? "LIMIT ROWS EXAMINED" :
                     thd->get_stmt_da()->message());
 
     if (global_system_variables.log_warnings > 1)