alamb commented on code in PR #15769:
URL: https://github.com/apache/datafusion/pull/15769#discussion_r2070806936
##########
datafusion/sqllogictest/test_files/push_down_filter.slt:
##########
@@ -218,43 +219,57 @@ LOCATION 'test_files/scratch/push_down_filter/t.parquet';
query TT
explain select a from t where a = '100';
----
-logical_plan TableScan: t projection=[a], full_filters=[t.a = Int32(100)]
+logical_plan
+01)Filter: t.a = Int32(100)
+02)--TableScan: t projection=[a], partial_filters=[t.a = Int32(100)]
# The predicate should not have a column cast when the value is a valid i32
query TT
explain select a from t where a != '100';
----
-logical_plan TableScan: t projection=[a], full_filters=[t.a != Int32(100)]
+logical_plan
+01)Filter: t.a != Int32(100)
+02)--TableScan: t projection=[a], partial_filters=[t.a != Int32(100)]
Review Comment:
I recommend we change these tests to show the physical plans (not the
logical plans) as that would more accurately show the pushdown happening. Maybe
also something we could do as a separate PR
##########
datafusion/sqllogictest/test_files/parquet_filter_pushdown.slt:
##########
@@ -81,11 +81,15 @@ EXPLAIN select a from t_pushdown where b > 2 ORDER BY a;
----
logical_plan
01)Sort: t_pushdown.a ASC NULLS LAST
-02)--TableScan: t_pushdown projection=[a], full_filters=[t_pushdown.b >
Int32(2)]
+02)--Projection: t_pushdown.a
+03)----Filter: t_pushdown.b > Int32(2)
+04)------TableScan: t_pushdown projection=[a, b],
partial_filters=[t_pushdown.b > Int32(2)]
physical_plan
01)SortPreservingMergeExec: [a@0 ASC NULLS LAST]
02)--SortExec: expr=[a@0 ASC NULLS LAST], preserve_partitioning=[true]
-03)----DataSourceExec: file_groups={2 groups:
[[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/parquet_filter_pushdown/parquet_table/1.parquet],
[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/parquet_filter_pushdown/parquet_table/2.parquet]]},
projection=[a], file_type=parquet, predicate=b@1 > 2,
pruning_predicate=b_null_count@1 != row_count@2 AND b_max@0 > 2,
required_guarantees=[]
+03)----CoalesceBatchesExec: target_batch_size=8192
+04)------RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=2
+05)--------DataSourceExec: file_groups={2 groups:
[[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/parquet_filter_pushdown/parquet_table/1.parquet],
[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/parquet_filter_pushdown/parquet_table/2.parquet]]},
projection=[a], file_type=parquet, predicate=b@1 > 2 AND b@1 > 2
Review Comment:
I agree it is important to remove the coalesce / repartition
Maybe we can make a separate PR to move the filter pushdown code earlier in
the physical planning
An alternate could be to update the filter pushdown optimizer pass somehow
to remove these -- but I think it would be cleaner / easier to understand if
they were never added in the first place
##########
datafusion/sqllogictest/test_files/parquet_filter_pushdown.slt:
##########
@@ -81,11 +81,15 @@ EXPLAIN select a from t_pushdown where b > 2 ORDER BY a;
----
logical_plan
01)Sort: t_pushdown.a ASC NULLS LAST
-02)--TableScan: t_pushdown projection=[a], full_filters=[t_pushdown.b >
Int32(2)]
+02)--Projection: t_pushdown.a
+03)----Filter: t_pushdown.b > Int32(2)
+04)------TableScan: t_pushdown projection=[a, b],
partial_filters=[t_pushdown.b > Int32(2)]
Review Comment:
I think it makes sense and is ok that the logical plans show the filter not
pushed down
##########
datafusion/datasource-parquet/src/source.rs:
##########
@@ -589,4 +559,49 @@ impl FileSource for ParquetSource {
}
}
}
+
+ fn try_pushdown_filters(
+ &self,
+ fd: FilterDescription,
+ config: &datafusion_common::config::ConfigOptions,
+ ) -> datafusion_common::Result<FilterPushdownResult<Arc<dyn FileSource>>> {
+ let Some(file_schema) = self.file_schema.clone() else {
Review Comment:
maybe we file a follow on ticket
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