Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18849#discussion_r133999734
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -1175,6 +1205,27 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
client.listFunctions(db, pattern)
}
+ /** Detect whether a table is stored with Hive-compatible metadata. */
+ private def isHiveCompatible(table: CatalogTable): Boolean = {
--- End diff --
Let me revert the question for you: why is it bad to have the compatibility
bit be a table property?
You cannot make a non-compatible table compatible after it's been created.
At the very least, there is zero code that would achieve that today. And the
key to this fix is that the `alterTableSchema` method needs to know whether the
table is compatible or not in a reliable way.
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