Re implement logical plan walker

LiUSemWeb / HeFQUIN

HeFQUIN is a query federation engine for heterogeneous federations of graph data sources, including federations of knowledge graphs.

https://liusemweb.github.io/HeFQUIN/

Apache License 2.0

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Re implement logical plan walker #340

Closed huanyu-li closed 3 months ago

huanyu-li commented 3 months ago

The last three commits are for addressing above comments.

hartig commented 3 months ago

I will merge this PR now. The next task then is to extend the new TextBasedLogicalPlanPrinterImpl2 class that you introduce in this PR, by adding the functionality to print logical plans as shown in the mockup.

For that implementation you should not anymore use the toString() functions of the operators.