Dandandan commented on code in PR #8126:
URL: https://github.com/apache/arrow-datafusion/pull/8126#discussion_r1389869661
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datafusion/physical-plan/src/filter.rs:
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@@ -194,11 +194,13 @@ impl ExecutionPlan for FilterExec {
fn statistics(&self) -> Result<Statistics> {
let predicate = self.predicate();
+ let input_stats = self.input.statistics()?;
let schema = self.schema();
if !check_support(predicate, &schema) {
- return Ok(Statistics::new_unknown(&schema));
+ // assume worst case, that the filter is highly selective and
+ // returns all the rows from its input
+ return Ok(input_stats.clone().into_inexact());
Review Comment:
I wonder if we can make a slightly different assumption that is a better
metric, e.g. each filter returning 50% or 20% of input rows?
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