tanelk commented on a change in pull request #29092:
URL: https://github.com/apache/spark/pull/29092#discussion_r500207664
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
##########
@@ -1847,3 +1848,25 @@ object OptimizeLimitZero extends Rule[LogicalPlan] {
empty(ll)
}
}
+
+/**
+ * Generates filters for exploded expression, such that rows that would have
been removed
+ * by this [[Generate]] can be removed earlier - before joins and in data
sources.
+ */
+object InferFiltersFromGenerate extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
+ case g @ Generate(e: ExplodeBase, _, false, _, _, child)
Review comment:
I'm not familiar with other generators and focused only on the ones that
I regularly use.
But yes, I'm sure it can be expanded to include other Generators as well,
but there can be some exceptions.
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