[t:3221], fix on main

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@27605 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -6286,7 +6286,7 @@ double ha_tokudb::read_time(
     double total_scan;
     double ret_val; 
     bool is_primary = (index == primary_key);
-    bool is_clustering = (table->key_info[index].flags & HA_CLUSTERING);
+    bool is_clustering;
 
     //
     // in case for hidden primary key, this is called
@@ -6296,6 +6296,8 @@ double ha_tokudb::read_time(
         goto cleanup;
     }
     
+    is_clustering = (table->key_info[index].flags & HA_CLUSTERING);
+
 
     //
     // if it is not the primary key, and it is not a clustering key, then return handler::read_time