cloud-fan commented on a change in pull request #34575:
URL: https://github.com/apache/spark/pull/34575#discussion_r772861339
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/SchemaPruning.scala
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@@ -164,7 +164,12 @@ object SchemaPruning extends Rule[LogicalPlan] {
outputRelation: LogicalRelation,
prunedBaseRelation: HadoopFsRelation) = {
val prunedOutput = getPrunedOutput(outputRelation.output,
prunedBaseRelation.schema)
- outputRelation.copy(relation = prunedBaseRelation, output = prunedOutput)
+ // also add the metadata output if any
+ // TODO: should be able to prune the metadata schema
Review comment:
makes sense. Let's update this rule or add a new rule
`MetadataSchemaPruning` later.
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