Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/18869 If @viirya were a new contributor, I am fine to merge it. In contrast, @viirya is experienced and knew the code base pretty well. Thus, I hope we can make our docs and test coverage much better. Below is the doc I am comparing. You can easily see the gap we have. The test cases we have are so few. We will see more bugs when adding new test cases. https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000746.html
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