HHH-9174 Increase performance

of SqlExceptionHelper#handleAndClearWarnings

hibernate-core/src/main/java/org/hibernate/engine/jdbc/spi/SqlExceptionHelper.java

@@ -284,12 +284,17 @@ public class SqlExceptionHelper {
     @SuppressWarnings( {"ThrowableResultOfMethodCallIgnored"} )
     public void handleAndClearWarnings( Statement statement,
                                         WarningHandler handler ) {
+    	// See HHH-9174.  Statement#getWarnings can be an expensive call for many JDBC libs.  Don't do it unless
+    	// the log level would actually allow a warning to be logged.
+    	if (LOG.isEnabled(Level.WARN)) {
 	    	try {
 	            walkWarnings(statement.getWarnings(), handler);
 	        } catch (SQLException sqlException) {
 	            // workaround for WebLogic
 	            LOG.debug("could not log warnings", sqlException);
 	        }
+    	}
+    	
         try {
             // Sybase fail if we don't do that, sigh...
             statement.clearWarnings();