Github user AydinChavez commented on the issue:
https://github.com/apache/spark/pull/17190
Anybody responsible for bringing this one to life? I think a jdbc sink is
an essential feature (or database writing in general) for structured streaming.
One manual way by implementing it via a custom ForEachWriter is not useful
due to lots of conn opens/terminations in its open+close methods - see also:
https://stackoverflow.com/questions/47130229/spark-2-2-struct-streaming-foreach-writer-jdbc-sink-lag
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