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From "Xiao Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-18543) SaveAsTable(CTAS) using overwrite could change table definition
Date Sat, 26 Nov 2016 22:52:58 GMT

    [ https://issues.apache.org/jira/browse/SPARK-18543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15698641#comment-15698641
] 

Xiao Li commented on SPARK-18543:
---------------------------------

For a clean fix, this requires refactoring on multiple components. Thus, this might not be
a good JIRA for you to start.

> 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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