geoffreyclaude commented on code in PR #16685:
URL: https://github.com/apache/datafusion/pull/16685#discussion_r2187358106
##########
datafusion/sql/src/relation/mod.rs:
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@@ -281,3 +796,49 @@ fn optimize_subquery_sort(plan: LogicalPlan) ->
Result<Transformed<LogicalPlan>>
});
new_plan
}
+
+/// Helper: determine optional filter predicate based on ROWS PER MATCH
+fn rows_filter(rpm: &Option<RowsPerMatch>) -> Option<Expr> {
+ match rpm {
+ // ONE ROW PER MATCH (default): keep last match row only
Review Comment:
Implementation "shortcut" for proof-of-concept: a more efficient
implementation would be to have real aggregation on the ONE ROW PER. MATCH,
grouped by the partition keys and match number.
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