Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16549#discussion_r95716115
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/MetastoreRelation.scala ---
@@ -49,8 +49,7 @@ private[hive] case class MetastoreRelation(
override def equals(other: Any): Boolean = other match {
case relation: MetastoreRelation =>
databaseName == relation.databaseName &&
- tableName == relation.tableName &&
- output == relation.output
+ tableName == relation.tableName
--- End diff --
if the underlying Hive tables change the schema, I think we will break many
places, as we cache the table relation. In the overwrite case, although the
table schema changed, they are still the same table.
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