I was implementing UDAF based on calcite, but found that merge method is not implemented:
https://github.com/apache/calcite/blob/0938c7b6d767e3242874d87a30d9112512d9243a/core/src/main/java/org/apache/calcite/schema/impl/AggregateFunctionImpl.java#L86 I just wonder why it is not implemented? As a newbie to calcite, it seems not so hard to implement the merge. Are there any issue blocking the implemention of merge, or just a matter of time? If it is just a matter of time, I'd like to spend some time implementing it. Thanks in advance. James
