Fix for bug #31742: delete from ... order by function call that causes

an error, asserts server

In case of a fatal error during filesort in find_all_keys() the error
was returned without the necessary handler uninitialization.
Fixed by changing the code so that handler uninitialization is performed
before returning the error.

mysql-test/r/delete.result

@@ -271,3 +271,11 @@ a
 DROP TABLE t1, t2;
 DROP DATABASE db1;
 DROP DATABASE db2;
+CREATE FUNCTION f1() RETURNS INT RETURN 1;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (0);
+DELETE FROM t1 ORDER BY (f1(10)) LIMIT 1;
+ERROR 42000: Incorrect number of arguments for FUNCTION test.f1; expected 0, got 1
+DROP TABLE t1;
+DROP FUNCTION f1;
+End of 5.0 tests

mysql-test/t/delete.test

@@ -277,3 +277,18 @@ SELECT * FROM t1;
 DROP TABLE t1, t2;
 DROP DATABASE db1;
 DROP DATABASE db2;
+
+#
+# Bug 31742: delete from ... order by function call that causes an error, 
+#            asserts server
+#
+
+CREATE FUNCTION f1() RETURNS INT RETURN 1;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (0);
+--error 1318
+DELETE FROM t1 ORDER BY (f1(10)) LIMIT 1;
+DROP TABLE t1;
+DROP FUNCTION f1;
+
+--echo End of 5.0 tests

sql/filesort.cc

@@ -534,7 +534,7 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
       file->unlock_row();
     /* It does not make sense to read more keys in case of a fatal error */
     if (thd->net.report_error)
-      DBUG_RETURN(HA_POS_ERROR);
+      break;
   }
   if (quick_select)
   {
@@ -551,6 +551,9 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
       file->ha_rnd_end();
   }
 
+  if (thd->net.report_error)
+    DBUG_RETURN(HA_POS_ERROR);
+  
   DBUG_PRINT("test",("error: %d  indexpos: %d",error,indexpos));
   if (error != HA_ERR_END_OF_FILE)
   {