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https://issues.apache.org/jira/browse/SPARK-14130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lichenglin updated SPARK-14130:
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Comment: was deleted
(was: "TOK_ALTERTABLE_ADDCOLS" is a very important command for data warehouse.
Does spark have any plan to support for it??
)
> [Table related commands] Alter column
> -------------------------------------
>
> Key: SPARK-14130
> URL: https://issues.apache.org/jira/browse/SPARK-14130
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
> Fix For: 2.0.0
>
>
> For alter column command, we have the following tokens.
> TOK_ALTERTABLE_RENAMECOL
> TOK_ALTERTABLE_ADDCOLS
> TOK_ALTERTABLE_REPLACECOLS
> For data source tables, we should throw exceptions. For Hive tables, we
> should support them. *For Hive tables, we should check Hive's behavior to see
> if there is any file format that does not any of above command*.
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/DDLTask.java
> is a good reference for Hive's behavior.
> Also, for a Hive table stored in a format, we need to make sure that even if
> Spark can read this tables after an alter column operation. If we cannot read
> the table, even Hive allows the alter column operation, we should still throw
> an exception. For example, if renaming a column of a Hive parquet table
> causes the renamed column inaccessible (we cannot read values), we should not
> allow this renaming operation.
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