perf: support pushing physical filters down through DeltaScan (#3859)

Author: alexwilcoxson-rel

crates/core/src/delta_datafusion/table_provider.rs

@@ -29,6 +29,7 @@ use datafusion::logical_expr::utils::split_conjunction;
 use datafusion::logical_expr::{BinaryExpr, LogicalPlan, Operator};
 use datafusion::optimizer::simplify_expressions::ExprSimplifier;
 use datafusion::physical_optimizer::pruning::PruningPredicate;
+use datafusion::physical_plan::filter_pushdown::{FilterDescription, FilterPushdownPhase};
 use datafusion::physical_plan::metrics::{ExecutionPlanMetricsSet, MetricBuilder, MetricsSet};
 use datafusion::physical_plan::{
     stream::RecordBatchStreamAdapter, DisplayAs, DisplayFormatType, ExecutionPlan, PhysicalExpr,
@@ -980,6 +981,18 @@ impl ExecutionPlan for DeltaScan {
     fn partition_statistics(&self, partition: Option<usize>) -> Result<Statistics> {
         self.parquet_scan.partition_statistics(partition)
     }
+
+    fn gather_filters_for_pushdown(
+        &self,
+        _phase: FilterPushdownPhase,
+        parent_filters: Vec<Arc<dyn PhysicalExpr>>,
+        _config: &ConfigOptions,
+    ) -> Result<FilterDescription> {
+        Ok(FilterDescription::from_children(
+            parent_filters,
+            &self.children(),
+        )?)
+    }
 }
 
 /// The logical schema for a Deltatable is different from the protocol level schema since partition