[SPARK-51609][SQL] Optimize Recursive CTE execution for simple queries #50402
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What changes were proposed in this pull request?
Optimize Recursive CTEs where the recursion is simple, and everything can be done in-memory. Specifically for the cases where the anchor is a LocalRelation or OneRowRelation and the recursion can be done in-memory.
Why are the changes needed?
To optimize Recursive CTEs.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Add a new Suite for testing Recursive CTEs. In there two tests where we test one case each for both LocalRelation and OneRowRelation. Checked that they're faster now.
Was this patch authored or co-authored using generative AI tooling?
No.