[t:2817], have prepare_drop_index reopen dictionaries if removing them fails

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@22869 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -6641,10 +6641,28 @@ int ha_tokudb::prepare_drop_index(TABLE *table_arg, uint *key_num, uint num_of_k
         error = delete_or_rename_dictionary(share->table_name, NULL, table_arg->key_info[curr_index].name, true, txn, true);
         if (error) { goto cleanup; }
     }
+
 cleanup:
     if (txn) {
         if (error) {
             abort_txn(txn);
+            //
+            // reopen closed dictionaries
+            //
+            for (uint i = 0; i < num_of_keys; i++) {
+                int r;
+                uint curr_index = key_num[i];
+                if (share->key_file[curr_index] == NULL) {
+                    r = open_secondary_dictionary(
+                        &share->key_file[curr_index], 
+                        &table_share->key_info[curr_index],
+                        share->table_name,
+                        false, // 
+                        NULL
+                        );
+                    assert(!r);
+                }
+            }            
         }
         else {
             commit_txn(txn,0);