Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18849#discussion_r133134000
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -342,6 +359,12 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
"Hive metastore in Spark SQL specific format, which is NOT
compatible with Hive. "
(None, message)
+ case _ if currentSessionConf(SQLConf.CASE_SENSITIVE) =>
--- End diff --
I think we should look at the schema instead of looking at the config. It's
possible that even case sensitive config is on, the column names are all
lowercased and it's still hive compatible.
My proposal: checking `schema.asLowerCased == schema`, if it's false, then
it's not hive compatible. We need to add `StructType.asLowerCased` though.
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