alamb commented on a change in pull request #657:
URL: https://github.com/apache/arrow-datafusion/pull/657#discussion_r663851278
##########
File path: datafusion/src/physical_plan/parquet.rs
##########
@@ -555,21 +625,29 @@ fn build_row_group_predicate(
row_group_metadata,
parquet_schema,
};
-
let predicate_values = predicate_builder.prune(&pruning_stats);
- let predicate_values = match predicate_values {
- Ok(values) => values,
+ match predicate_values {
+ Ok(values) => Box::new(move |_, i| {
+ // NB: false means don't scan row group
+ if !values[i] {
Review comment:
One difference that results from updating the metrics right before use
is what happens in a `limit` query -- ala `SELECT * from parquet_table where
date < 2012-20-20 limit 10` -- in this case the query might never even
contemplate reading a particular partition due to the limit
However, having written that I think it would make the statistics easier to
understand (and more consistent query to query) to report the stats prior to
the actual function. I will make that change
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