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https://issues.apache.org/jira/browse/SPARK-15231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15277003#comment-15277003
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Apache Spark commented on SPARK-15231:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/13013
> Document the semantic of saveAsTable and insertInto and don't drop columns
> silently
> -----------------------------------------------------------------------------------
>
> Key: SPARK-15231
> URL: https://issues.apache.org/jira/browse/SPARK-15231
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
>
> We should document the difference between "insertInto" and "saveAsTable":
> "insertInto" is using the position-based column resolution but "saveAsTable
> with append" is using name based resolution.
> In addition, for "saveAsTable with append", when try to add more columns, we
> just drop the new columns silently. The correct behavior should be throwing
> an exception.
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