wangyum commented on a change in pull request #31993:
URL: https://github.com/apache/spark/pull/31993#discussion_r612033519
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala
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@@ -89,14 +93,12 @@ object PushDownUtils extends PredicateHelper {
} else {
new StructType()
}
- r.pruneColumns(prunedSchema)
+ val neededFieldNames = neededOutput.map(_.name).toSet
+ r.pruneColumns(StructType(prunedSchema.filter(f =>
neededFieldNames.contains(f.name))))
Review comment:
Move [filter logical from
`SchemaPruning`](https://github.com/apache/spark/blob/0f2c0b53e8fb18c86c67b5dd679c006db93f94a5/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SchemaPruning.scala#L38-L39)
to `PushDownUtils` to support datasource V2 column pruning.
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