[SPARK-54310][SQL] Add numSourceRows metric for MergeIntoExec
#53571
+415
−275
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What changes were proposed in this pull request?
Add
numSourceRowsmetric forMergeIntoExec, from source node'snumOutputRows.Update the original attempt to allowlist supported nodes, to account the case of children nodes which do not correctly propagate the numOutputRows metric (e.g. SparkExtension nodes). For non-supported nodes, the default
numSourceRowsreturned is -1.Why are the changes needed?
Improve completeness and debuggability of Merge Into metrics.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Unit test cases for numSourceNodes metric, with an added test case for empty source.
Was this patch authored or co-authored using generative AI tooling?
No.