ajithme commented on issue #25448: [SPARK-28697][SQL] Invalidate Database/Table names starting with underscore URL: https://github.com/apache/spark/pull/25448#issuecomment-523283547 > According to the discussions in this PR, seems there are many other databases allowing the identifiers to start with `_`. Spark can support it as well without hive support. Shall we add the check only in `HiveExternalCatalog.createTable`? @cloud-fan @HyukjinKwon This for inputs. Would it not differ spark behavior when hive support is enabled or disabled.? (Hive cannot support _ starting identifiers due to limitations in FileFormat which affect its extended classes too) I think the identifier support inside spark should be uniform. Please correct me if i am wrong. Else i am ok to add check only at ``HiveExternalCatalog.createTable`` so that we can get more proper error message and mark this as a limitation when hive support is enabled
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