Merge branch '1.10_test_4.1.x' into 1.10_release_4.1.x

Author: gituser

impala/impala-sink/src/main/java/com/dtstack/flink/sql/sink/impala/ImpalaOutputFormat.java

@@ -34,7 +34,6 @@
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
-import java.rmi.RemoteException;
 import java.security.PrivilegedExceptionAction;
 import java.sql.Connection;
 import java.sql.DriverManager;
@@ -52,7 +51,6 @@
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicReference;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
@@ -630,7 +628,7 @@ private String quoteIdentifier(String identifier) {
     public static Builder getImpalaBuilder() {
         return new Builder();
     }
-
+    
     public static class Builder {
         private final ImpalaOutputFormat format = new ImpalaOutputFormat();