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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