Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/13701#discussion_r68353312
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala
---
@@ -85,8 +85,15 @@ private[sql] object FileSourceStrategy extends Strategy
with Logging {
ExpressionSet(normalizedFilters.filter(_.references.subsetOf(partitionSet)))
logInfo(s"Pruning directories with:
${partitionKeyFilters.mkString(",")}")
- val dataColumns =
- l.resolve(fsRelation.dataSchema,
fsRelation.sparkSession.sessionState.analyzer.resolver)
+ val dataColumns = l.resolve(fsRelation.dataSchema,
+ fsRelation.sparkSession.sessionState.analyzer.resolver).map { c =>
+ fsRelation.dataSchema.find(_.name == c.name).map { f =>
+ c match {
+ case a: AttributeReference => a.withMetadata(f.metadata)
+ case _ => c
+ }
+ }.getOrElse(c)
+ }
--- End diff --
We use metadata in merged schema to mark the optional field (not existing
in all partitions), the metadata is lost after resolving. If we don't add them
back, the pushed-down filters will be failed due to non existing field error.
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