maropu commented on a change in pull request #29092:
URL: https://github.com/apache/spark/pull/29092#discussion_r489922948
##########
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] {
Review comment:
I thought first we might be able to do so, but it looks okay as it is on
second thoughts.
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