As far as overriding, you can checkout what we do at Dremio: https://github.com/dremio/dremio-oss/blob/master/sabot/kernel/src/main/java/com/dremio/exec/planner/cost/RelMdColumnUniqueness.java https://github.com/dremio/dremio-oss/blob/master/sabot/kernel/src/main/java/com/dremio/exec/planner/cost/DremioRelMetadataHandlerProvider.java
I think what you are saying makes sense. I haven't looked closely at the original commit, but I wonder if they meant to do something like: if c = constant, then replace isUnique(a,b,c) with isUnique(a,b) but they did the reverse, replacing isUnique(a,b) with isUnique(a,b,c) On Fri, Mar 7, 2025 at 11:13 AM Ian Bertolacci <ian.bertola...@workday.com.invalid> wrote: > Related: I have absolutely no idea how to make a minor override to > RelMdColumnUniqueness without modifying the class itself. > I really don’t understand how all this bespoke reflection works, or how > to augment the behavior of existing handlers. > Is there any documentation, guides, or examples that will help me > understand this? > Thanks! > -Ian >
