The next step is starting to get isthmus support for it, so I went ahead and created WindowRelFunctionConverter so we can start using it to properly bind our window function calls.
It is heavily based on WindowFunctionConverter (although both the input and output changes - input from RexOver to RexWinAggCall, and output from WindowFunctionInvocation to WindowRelFunctionInvocation), so I extracted some converters to top-level classes to improve reusability.
We recently added POJOs for ConsistentPartitionWindowRel and WindowRelFunction. https://github.com/substrait-io/substrait-java/pull/231
The next step is starting to get isthmus support for it, so I went ahead and created WindowRelFunctionConverter so we can start using it to properly bind our window function calls.
It is heavily based on WindowFunctionConverter (although both the input and output changes - input from
RexOvertoRexWinAggCall, and output fromWindowFunctionInvocationtoWindowRelFunctionInvocation), so I extracted some converters to top-level classes to improve reusability.