huaxingao commented on a change in pull request #33650:
URL: https://github.com/apache/spark/pull/33650#discussion_r731149624
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala
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@@ -40,37 +40,43 @@ object PushDownUtils extends PredicateHelper {
def pushFilters(
scanBuilder: ScanBuilder,
filters: Seq[Expression]): (Seq[sources.Filter], Seq[Expression]) = {
+ // A map from translated data source leaf node filters to original
catalyst filter
+ // expressions. For a `And`/`Or` predicate, it is possible that the
predicate is partially
+ // pushed down. This map can be used to construct a catalyst filter
expression from the
+ // input filter, or a superset(partial push down filter) of the input
filter.
Review comment:
The postScan filers are those that can't be pushed down to data source.
Basically, we put the un-pushable filters in postScan filers so these filters
will be applied by Spark.
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