MDEV-23445: LIMIT ROWS EXAMINED throws error in Debug build only

Analysis: When we reach the maximum limit to examine rows killed_state is set
as ABORT. But this isn't an actual error and we still return TRUE. This
eventually sets error as UNKNOWN ERROR.
Fix: Check if need to stop execution by checking the killed state. If we have
to abort it, return false because this isn't an actual error.

mysql-test/main/information_schema.test

@@ -1932,14 +1932,7 @@ SELECT SCHEMA_NAME from information_schema.schemata where schema_name=REPEAT('a'
 --echo # Diagnostics_area::sql_errno upon query from I_S with LIMIT ROWS EXAMINED
 --echo #
 
-if ($have_debug) {
---error ER_UNKNOWN_ERROR
 SELECT * FROM INFORMATION_SCHEMA.`COLUMNS` LIMIT ROWS EXAMINED 10;
-SHOW WARNINGS;
-}
-if (!$have_debug) {
-SELECT * FROM INFORMATION_SCHEMA.`COLUMNS` LIMIT ROWS EXAMINED 10;
-}
 
 --echo #
 --echo # End of 10.2 Test

sql/sql_show.cc

@@ -5273,6 +5273,11 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
             free_root(&tmp_mem_root, MY_MARK_BLOCKS_FREE);
           }
         }
+        if (thd->killed == ABORT_QUERY)
+        {
+          error= 0;
+          goto err;
+        }
       }
     }
   }