Hi, We want to create a ConverterRule which converts the default calling Convention to external storage-specific calling convention depending on the Children nodes, like RelOptRule.
For example, depending on the properties of the child nodes, we want to convert LogicalJoin to external system's specific Join implementation. Currently, ConverterRule <https://github.com/apache/calcite/blob/5212d6c47e36995943f4d955a1714bf03eb08e7e/core/src/main/java/org/apache/calcite/rel/convert/ConverterRule.java#L75> cannot take Children and Child Policy is RelOptRuleOperandChildPolicy.ANY. What is the preferred way to achieve this task? Thanks, Rahul
