[SPARK-51655][SQL] Fix metric collection in UnionLoopExec and add test #50449
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What changes were proposed in this pull request?
Fix metrics collection method for Recursive CTEs. Also, add new metric which tracks the number of rows that the anchor returns.
Why are the changes needed?
Current way of collecting metrics for recursive CTEs is incorrect.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
New test in SQLMetricsSuite.
Was this patch authored or co-authored using generative AI tooling?
No.