Bug #57321 crashes and valgrind errors from spatial types

        Item_func_spatial_collection::fix_length_and_dec didn't call parent's method, so
        the maybe_null was set to '0' after it. But in this case the result was
        just NULL, that caused wrong behaviour.

per-file comments:
  mysql-test/r/gis.result
Bug #57321 crashes and valgrind errors from spatial types 
        test result updated.

  mysql-test/t/gis.test
Bug #57321 crashes and valgrind errors from spatial types 
        test case added.
  sql/item_geofunc.h
Bug #57321 crashes and valgrind errors from spatial types 
        Item_func_geometry::fix_length_and_dec() called in
        Item_func_spatial_collection::fix_length_and_dec().

mysql-test/r/gis.result

@@ -1014,4 +1014,12 @@ SET @a=0x00000000030000000100000000000000000000000000144000000000000014400000000
 SET @a=POLYFROMWKB(@a);
 SET @a=0x00000000030000000000000000000000000000000000144000000000000014400000000000001840000000000000184000000000000014400000000000001440;
 SET @a=POLYFROMWKB(@a);
+create table t1(a polygon NOT NULL)engine=myisam;
+insert into t1 values (geomfromtext("point(0 1)"));
+insert into t1 values (geomfromtext("point(1 0)"));
+select * from (select polygon(t1.a) as p from t1 order by t1.a) d;
+p
+NULL
+NULL
+drop table t1;
 End of 5.1 tests

mysql-test/t/gis.test

@@ -744,4 +744,14 @@ SET @a=0x00000000030000000000000000000000000000000000144000000000000014400000000
 SET @a=POLYFROMWKB(@a);
 
 
+#
+# Bug #57321    crashes and valgrind errors from spatial types
+#
+
+create table t1(a polygon NOT NULL)engine=myisam;
+insert into t1 values (geomfromtext("point(0 1)"));
+insert into t1 values (geomfromtext("point(1 0)"));
+select * from (select polygon(t1.a) as p from t1 order by t1.a) d;
+drop table t1;
+
 --echo End of 5.1 tests

sql/item_geofunc.h

@@ -177,6 +177,7 @@ public:
   String *val_str(String *);
   void fix_length_and_dec()
   {
+    Item_geometry_func::fix_length_and_dec();
     for (unsigned int i= 0; i < arg_count; ++i)
     {
       if (args[i]->fixed && args[i]->field_type() != MYSQL_TYPE_GEOMETRY)