cloud-fan commented on a change in pull request #34023:
URL: https://github.com/apache/spark/pull/34023#discussion_r710681876
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
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@@ -144,13 +144,15 @@ object ScanOperation extends OperationHelper with
PredicateHelper {
case Filter(condition, child) =>
collectProjectsAndFilters(child) match {
case Some((fields, filters, other, aliases)) =>
- // Follow CombineFilters and only keep going if 1) the collected
Filters
- // and this filter are all deterministic or 2) if this filter is
the first
- // collected filter and doesn't have common non-deterministic
expressions
- // with lower Project.
+ // When collecting projects and filters, we effectively push down
filters through
+ // projects. We need to meet the following conditions to do so:
+ // 1) no Project collected so far or the collected Projects are
all deterministic
Review comment:
yea
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