Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/4826#discussion_r25593397
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetRelation.scala ---
@@ -172,9 +173,14 @@ private[sql] object ParquetRelation {
sqlContext.conf.parquetCompressionCodec.toUpperCase,
CompressionCodecName.UNCOMPRESSED)
.name())
ParquetRelation.enableLogForwarding()
- ParquetTypesConverter.writeMetaData(attributes, path, conf)
+ // This is a hack. We always set
nullable/containsNull/valueContainsNull to true
+ // for the schema of a parquet data.
+ val schema =
+
DataType.alwaysNullable(StructType.fromAttributes(attributes)).asInstanceOf[StructType]
+ val newAttributes = schema.toAttributes
+ ParquetTypesConverter.writeMetaData(newAttributes, path, conf)
new ParquetRelation(path.toString, Some(conf), sqlContext) {
- override val output = attributes
+ override val output = newAttributes
--- End diff --
Never mind, since we always write nullable data, it should be OK to leave
`ParquetRelation.output` untouched.
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