morristai commented on code in PR #26634:
URL: https://github.com/apache/datafusion/pull/26634#discussion_r4552772490
##########
datafusion/physical-optimizer/src/projection_pushdown.rs:
##########
@@ -433,6 +465,28 @@ impl<'a> JoinFilterRewriter<'a> {
}
}
+/// Returns the number of leading children of `expr` that are evaluated for
every row, or `None`
+/// if all children are. The remaining children may be skipped for some rows.
+///
+/// Mirrors `conditional_children` in the logical `CommonSubexprEliminate`
rule.
+fn always_evaluated_child_count(expr: &dyn PhysicalExpr) -> Option<usize> {
+ if let Some(case) = expr.downcast_ref::<CaseExpr>() {
+ // The children are the optional base expression, then each WHEN/THEN
pair, then the
+ // optional ELSE. Only the base expression and the first WHEN are
always evaluated.
+ Some(usize::from(case.expr().is_some()) + 1)
Review Comment:
fixed and added regression test in `nested_loop_join_conditional.slt`.
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