[SPARK-12048][SQL] Prevent to close JDBC resources twice
Author: gcc <spark-src@condor.rhaag.ip> Closes #10101 from rh99/master.
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@ -511,6 +511,7 @@ private[sql] class JDBCRDD(
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} catch {
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case e: Exception => logWarning("Exception closing connection", e)
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}
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closed = true
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}
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override def hasNext: Boolean = {
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