Github user juliuszsompolski commented on the issue:
https://github.com/apache/spark/pull/17289
@gatorsmile
It relates to JDBC source, because if you do e.g.
.mode(SaveMode.ErrorIfExists).saveAsTable("foo")
on a JDBC source, and the table exists in JDBC but does not exist in Spark
catalog, it will nevertheless overwrite the table in JDBC (and create it in the
Spark catalog), which I found confusing when encountering it.
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