muien5080 opened a new pull request, #19106:
URL: https://github.com/apache/datafusion/pull/19106
This update adds documentation for `NestedLoopJoinExec` to the EXPLAIN
ANALYZE
/ metrics user guide. The operator recently gained a `selectivity` metric,
and this PR documents its behavior along with the other join operators.
The new section explains:
* What `NestedLoopJoinExec` is used for (non-equijoins and cases where hash
or sort-merge joins cannot be applied)
* The metrics it reports under EXPLAIN ANALYZE
* The meaning of the new `selectivity` metric (`output_rows / input_rows`)
* An example output fragment from an EXPLAIN ANALYZE plan
This helps users interpret nested-loop join behavior and understand join
selectivity during query analysis.
Related: apache/datafusion#19045
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