maropu commented on a change in pull request #24202: [SPARK-27268][SQL] Add
map_keys and map_values support in nested schema pruning.
URL: https://github.com/apache/spark/pull/24202#discussion_r268685624
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ProjectionOverSchema.scala
##########
@@ -49,6 +49,10 @@ case class ProjectionOverSchema(schema: StructType) {
s"unmatched child schema for GetArrayStructFields:
${projSchema.toString}"
)
}
+ case MapKeys(child) =>
+ getProjection(child).map { projection => MapKeys(projection) }
+ case MapValues(child) =>
+ getProjection(child).map { projection => MapValues(projection) }
Review comment:
All the extraction expressions listed in `SelectedField` basically should
appear in this file?
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