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https://issues.apache.org/jira/browse/SPARK-18543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15696586#comment-15696586
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Thomas Sebastian commented on SPARK-18543:
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I would like to take a look at this fix, if you have not already started.
> SaveAsTable(CTAS) using overwrite could change table definition
> ---------------------------------------------------------------
>
> Key: SPARK-18543
> URL: https://issues.apache.org/jira/browse/SPARK-18543
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.3, 2.0.2
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> When the mode is OVERWRITE, we drop the Hive serde tables and create a data
> source table. This is not right.
> {code}
> val tableName = "tab1"
> withTable(tableName) {
> sql(s"CREATE TABLE $tableName STORED AS SEQUENCEFILE AS SELECT 1 AS
> key, 'abc' AS value")
> val df = sql(s"SELECT key, value FROM $tableName")
> df.write.mode(SaveMode.Overwrite).saveAsTable(tableName)
> val tableMeta =
> spark.sessionState.catalog.getTableMetadata(TableIdentifier(tableName))
> assert(tableMeta.provider ==
> Some(spark.sessionState.conf.defaultDataSourceName))
> }
> {code}
> Based on the definition of OVERWRITE, no change should be made on the table
> definition. When recreate the table, we need to create a Hive serde table.
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