>There is no explicit time zone here provided, only the implicit one based on
There's connection-default time zone (see org.apache.calcite.DataContext.Variable#TIME_ZONE ) I think the way to go there is: 1) Convert SqlNod to Rex via SqlToRelConverter 2) Evaluate the Rex with something like ReduceExpressionsRule with exception that non-constant parameters are replaced with nulls (ReduceExpressionsRule has a machinery to determine if expression is a constant or not) That would make the thing consistent with existing computations/casts (which are tricky to get right). Vladimir
