findepi commented on code in PR #17139:
URL: https://github.com/apache/datafusion/pull/17139#discussion_r2270199837
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datafusion/optimizer/src/optimize_projections/mod.rs:
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@@ -1146,9 +1139,7 @@ mod tests {
plan,
@r"
Aggregate: groupBy=[[]], aggr=[[count(Int32(1))]]
- Projection:
- Aggregate: groupBy=[[]], aggr=[[count(Int32(1))]]
- TableScan: ?table? projection=[]
+ EmptyRelation
Review Comment:
table scan gets replaced with 1-row VALUES (that would be more visible if we
merge https://github.com/apache/datafusion/pull/17145)
we could further eliminate `count(*)` on top of a relation with known
cardinality. follow-up potential
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