Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16737
: ) When @sureshthalamati tried to fix the docker test failure in Oracle,
he found the new code change in Spark 2.1 makes JDBC option key values always
lower case. However, Oracle's connection properties are case sensitive. Thus,
the changes caused the regression.
However, we realized the data source resolution always set the options to
lower cases, as discussed in https://github.com/apache/spark/pull/14773. Thus,
I think it is safe to do it, but we need to document the workaround if users
hit this issue for JDBC sources. @sureshthalamati is doing it.
Thus, this PR is ready to review. Thanks!
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