andygrove commented on PR #5394:
URL: 
https://github.com/apache/datafusion-comet/pull/5394#issuecomment-5769943390

   @sunchao on the removed-root-sort residual from your last review: this is 
handled in 0896e36ed. Rather than chasing the mark through the rewrite, the 
query-stage-prep rule now recognizes a re-plan that AQE collapsed to nothing 
directly: its logical link has `maxRows == 0`. A genuinely empty query is still 
reported, because it is planned once and reaches the columnar rule instead. The 
empty-plan test matrix now includes your two-partition range merge join with 
`SORT BY a.id % 7`, under both `collect()` and `queryExecution.toRdd.count()`, 
with AQE on and off.


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