xudong963 commented on code in PR #22177:
URL: https://github.com/apache/datafusion/pull/22177#discussion_r3246164881
##########
datafusion/physical-plan/src/operator_statistics/mod.rs:
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@@ -809,11 +809,8 @@ impl StatisticsProvider for JoinStatisticsProvider {
_ => return left_rows.saturating_mul(right_rows),
}
}
- if ndv_divisor > 0 {
- left_rows.saturating_mul(right_rows) / ndv_divisor
- } else {
Review Comment:
The `checked_div(...).unwrap_or(max_rows)` form hides the "NDV unknown →
cartesian" intent
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