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https://issues.apache.org/jira/browse/SPARK-22306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210105#comment-16210105
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Dongjoon Hyun commented on SPARK-22306:
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Hi, [~cloud_fan] and [~smilegator].
Should we change the default value to prevent this regression?
> INFER_AND_SAVE overwrites important metadata in Metastore
> ---------------------------------------------------------
>
> Key: SPARK-22306
> URL: https://issues.apache.org/jira/browse/SPARK-22306
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Environment: Hive 2.3.0 (PostgresQL metastore)
> Spark 2.2.0
> Reporter: David Malinge
>
> I noticed some critical changes on my hive tables and realized that they were
> caused by a simple select on SparkSQL. Looking at the logs, I found out that
> this select was actually performing an update on the database "Saving
> case-sensitive schema for table".
> I then found out that Spark 2.2.0 introduces a new default value for
> spark.sql.hive.caseSensitiveInferenceMode (see SPARK-20888): INFER_AND_SAVE
> The issue is that this update changes critical metadata of the table, in
> particular:
> - changes the owner to the current user
> - removes bucketing metadata (BUCKETING_COLS, SDS)
> - removes sorting metadata (SORT_COLS)
> Switching the property to: NEVER_INFER prevents the issue.
> Also, note that the damage can be fix manually in Hive with e.g.:
> {code:sql}
> alter table [table_name]
> clustered by ([col1], [col2])
> sorted by ([colA], [colB])
> into [n] buckets
> {code}
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