cloud-fan commented on a change in pull request #26629: [SPARK-29768][SQL]
Column pruning through nondeterministic expressions
URL: https://github.com/apache/spark/pull/26629#discussion_r350047808
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
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@@ -74,24 +95,70 @@ object PhysicalOperation extends PredicateHelper {
case other =>
(None, Nil, other, AttributeMap(Seq()))
}
+}
- private def collectAliases(fields: Seq[Expression]):
AttributeMap[Expression] =
- AttributeMap(fields.collect {
- case a: Alias => (a.toAttribute, a.child)
- })
-
- private def substitute(aliases: AttributeMap[Expression])(expr: Expression):
Expression = {
- expr.transform {
- case a @ Alias(ref: AttributeReference, name) =>
- aliases.get(ref)
- .map(Alias(_, name)(a.exprId, a.qualifier))
- .getOrElse(a)
+/**
+ * Unlike PhysicalOperation, this operation would firstly search the first
non-Project
Review comment:
A variant of [[PhysicalOperation]]. It matches any number of project or
filter operations even if they are non-deterministic, as long as they satisfy
the requirement of `CollapseProject` and `CombineFilters`
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