closes #6290, allow for child transactions to change descriptors

git-svn-id: file:///svn/toku/tokudb@54517 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/test_transactional_descriptor.cc

@@ -166,7 +166,6 @@ static void run_test(void) {
             { int chk_r = db->change_descriptor(db, txn_create, &change_descriptor, 0); CKERR(chk_r); }
             // test some error cases
             IN_TXN_COMMIT(env, txn_create, txn_create2, 0, {
-                    { int chk_r = db->change_descriptor(db, txn_create2, &change_descriptor, 0); CKERR2(chk_r, EINVAL); }
                     { int chk_r = db->change_descriptor(db, txn_create, &change_descriptor, 0); CKERR2(chk_r, EINVAL); }
                 });
             assert_desc_four(db);

src/ydb_db.cc

@@ -481,10 +481,6 @@ toku_db_change_descriptor(DB *db, DB_TXN* txn, const DBT* descriptor, uint32_t f
         r = EINVAL;
         goto cleanup;
     }
-    if (txn && txn->parent != NULL) {
-        r = EINVAL; // cannot have a parent if you are a resetting op
-        goto cleanup;
-    }
     // For a hot index, this is an initial descriptor.
     // We do not support (yet) hcad with hot index concurrently on a single table, which
     // would require changing a descriptor for a hot index.