Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9940#discussion_r51232182
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -359,6 +361,18 @@ object StructType extends AbstractDataType {
protected[sql] def fromAttributes(attributes: Seq[Attribute]):
StructType =
StructType(attributes.map(a => StructField(a.name, a.dataType,
a.nullable, a.metadata)))
+ def removeMetadata(key: String, dt: DataType): DataType =
+ dt match {
+ case StructType(fields) =>
+ val newFields = fields.map { f =>
+ val mb = new MetadataBuilder()
--- End diff --
This PR is mostly a workaround for a parquet-mr bug (PARQUET-389), and I'd
assume that it will be fixed in the near future. Then we can remove this
workaround. So it doesn't seem to be worth modifying `MetadataBuilder`, which
is part of public API.
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