jayzhan211 commented on code in PR #13475:
URL: https://github.com/apache/datafusion/pull/13475#discussion_r1849437818
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datafusion/optimizer/src/push_down_filter.rs:
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@@ -998,7 +998,19 @@ impl OptimizerRule for PushDownFilter {
filter_predicates.len());
}
- let zip = filter_predicates.into_iter().zip(results);
+ let zip =
+ filter_predicates
+ .into_iter()
+ .zip(results)
+ .map(|(expr, res)| {
+ let filter_pushdown_type = if expr.is_volatile() {
Review Comment:
If there is possible that any table source can support volatile function
then this checking should happen in `supports_filters_pushdown`.
Otherwise, we should check `is_volatile` before `supports_filters_pushdown`,
so those table source don't need to care about whether the function is volatile
or not.
Given that volatile has no deterministic result, I think it doesn't make
sense to pushdown filter with those function, therefore I think we can check
volatility beforehand
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