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[SPARK-12088][SQL] check connection.isClosed before calling connection…
In Java Spec java.sql.Connection, it has boolean getAutoCommit() throws SQLException Throws: SQLException - if a database access error occurs or this method is called on a closed connection So if conn.getAutoCommit is called on a closed connection, a SQLException will be thrown. Even though the code catch the SQLException and program can continue, I think we should check conn.isClosed before calling conn.getAutoCommit to avoid the unnecessary SQLException. Author: Huaxin Gao <huaxing@oc0558782468.ibm.com> Closes #10095 from huaxingao/spark-12088.
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