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https://issues.apache.org/jira/browse/SPARK-19948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-19948.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.2.0
Issue resolved by pull request 17289
[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
> Fix For: 2.2.0
>
>
> 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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