Make `CartesianProductJoin` lazy.

RobinTF commented 2 weeks ago

This allows the CartesianProductJoin operation to produce lazy results as well as to consume a single lazy result itself. Currently only the last child of the Cartesian product can be consumed lazily, but this can in principle be changed in the future. In particular, the most memory-saving way would be to lazily consume the largest child that supports lazy evaluation.

codecov[bot] commented 2 weeks ago

Codecov Report

Attention: Patch coverage is 99.16667% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.24%. Comparing base (1bcfeeb) to head (02714c4). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/engine/CartesianProductJoin.cpp	99.16%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1609 +/- ## ========================================== + Coverage 89.21% 89.24% +0.02% ========================================== Files 372 372 Lines 34723 34818 +95 Branches 3915 3931 +16 ========================================== + Hits 30979 31072 +93 + Misses 2471 2470 -1 - Partials 1273 1276 +3 ```

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