Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/2543#discussion_r18078436
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -118,6 +119,19 @@ class Analyzer(catalog: Catalog, registry:
FunctionRegistry, caseSensitive: Bool
}
/**
+ * Replaces [[UnresolvedGetField]]s with concrete [[GetField]]
+ */
+ object ResolveGetField extends Rule[LogicalPlan] {
--- End diff --
This rule maybe a little overhead here, but its for future extendibility.
We may want to not only support get field of struct, but also get field of
array of struct.
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