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https://issues.apache.org/jira/browse/SPARK-19948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924125#comment-15924125
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Apache Spark commented on SPARK-19948:
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User 'juliuszsompolski' has created a pull request for this issue:
https://github.com/apache/spark/pull/17289
> Document that saveAsTable uses catalog as source of truth for table existence.
> ------------------------------------------------------------------------------
>
> Key: SPARK-19948
> URL: https://issues.apache.org/jira/browse/SPARK-19948
> Project: Spark
> Issue Type: Documentation
> Components: Documentation
> Affects Versions: 2.1.0
> Reporter: Juliusz Sompolski
>
> It is quirky behaviour that saveAsTable to e.g. a JDBC source with SaveMode
> other than Overwrite will nevertheless overwrite the table in the external
> source,if that table was not a catalog table.
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