You can set up the target traits to include the convention you want when invoke the Program#run method [1], with the converters as rules of the program.
[1] https://github.com/apache/calcite/blob/9ece70f5dcdb00dbc6712496c51f52c05178d4aa/core/src/main/java/org/apache/calcite/tools/Program.java#L38 Best, Danny Chan 在 2019年5月4日 +0800 PM6:48，Muhammad Gelbana <[email protected]>，写道： > I implemented a new convention but I'm facing difficulties with > implementing tables for that convention. > > Since I need to apply my convention rules and converters, I assume I must > implement TranslatableTable so I can override the RelNode produced by the > toRel method and provide the rules I need through the > RelNode.register(RelOptPlanner planner) call back (Is there another way ?) > > At the same time, I need for my table's RelNode to implement my > convention's interface. > > After implementing TranslatableTable and my convention's interface, I > discovered that my table's RelNode have to either implement an interpreter > node or the InterpretableRel interface. But this led to what seems to me as > that my table scan is executed twice. > > I tried many things, such as having my table extend TableScan, > AbstractEnumerable2 QueryableTable and other interfaces/class that either > didn't give me what I want or failed with strange exceptions. > > What I need is to implement my table scan following the same convention I'm > writing. So what is the correct way to do this ? > > The MongoDB adapter way is to implement the TranslatableTable and the > QueryableTable interfaces, but that's confusing me. I mean, it's already > implementing its own new convention interface, why would it need to > implement another one to implement its table scans ? I thought while > executing the final plan, the first calcite identified node (enumerable or > bindable, enumerable as in MongoDB adapter's example), the interpreter > would execute that node, which will internally execute all its input nodes > including the table scan, correct ? > > Thanks, > Gelbana
