Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18849#discussion_r131504834
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
---
@@ -908,7 +909,13 @@ private[hive] object HiveClientImpl {
}
// after SPARK-19279, it is not allowed to create a hive table with an
empty schema,
// so here we should not add a default col schema
- if (schema.isEmpty && DDLUtils.isDatasourceTable(table)) {
+ //
+ // Because HiveExternalCatalog sometimes writes back "raw" tables that
have not been
+ // completely translated to Spark's view, the provider information
needs to be looked
+ // up in two places.
+ val provider = table.provider.orElse(
--- End diff --
This change would have fixed the second exception in the bug (about storing
an empty schema); but the code was just ending up in that situation because of
the other problems this PR is fixing. This change shouldn't be needed for the
fix, but I included it for further correctness.
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