Github user cenyuhai commented on a diff in the pull request:
https://github.com/apache/spark/pull/4398#discussion_r24266591
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/dataTypes.scala ---
@@ -36,6 +36,8 @@ import org.apache.spark.util.Utils
object DataType {
+ private val curId = new java.util.concurrent.atomic.AtomicLong()
+ def newTypeId = curId.getAndIncrement()
--- End diff --
Now we use the AttributeReference to mark a column, but it is not suitable
for nested columns, we need to remove some fields in DataType, it is hard to
reconstruct the DataType, so I add a new id to uniquely identify the fields.
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