viirya commented on a change in pull request #27702: [SPARK-30955][SQL] Exclude
Generate output when aliasing in nested column pruning
URL: https://github.com/apache/spark/pull/27702#discussion_r384946779
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -104,19 +104,23 @@ object NestedColumnAliasing {
/**
* Return two maps in order to replace nested fields to aliases.
*
+ * If `exclusiveAttrs` is given, any nested field accessors of these
attributes
+ * won't be considered in nested fields aliasing.
+ *
* 1. ExtractValue -> Alias: A new alias is created for each nested field.
* 2. ExprId -> Seq[Alias]: A reference attribute has multiple aliases
pointing it.
*/
- def getAliasSubMap(exprList: Seq[Expression])
+ def getAliasSubMap(exprList: Seq[Expression], exclusiveAttrs: Seq[Attribute]
= Seq.empty)
Review comment:
I think yes, I will sync #27517 with this later.
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