Update interface extensions to extend JDBC interfaces (#561)

Author: gopalldb

src/main/java/com/databricks/jdbc/api/IDatabricksConnection.java

@@ -6,7 +6,7 @@
 import java.sql.Statement;
 
 /** Interface providing Databricks specific Connection APIs. */
-public interface IDatabricksConnection {
+public interface IDatabricksConnection extends Connection {
 
   /** Returns the underlying session for the connection. */
   IDatabricksSession getSession();

src/main/java/com/databricks/jdbc/api/IDatabricksResultSet.java

@@ -1,10 +1,11 @@
 package com.databricks.jdbc.api;
 
 import com.databricks.sdk.service.sql.StatementStatus;
+import java.sql.ResultSet;
 import java.sql.SQLException;
 
 /** Extension to java.sql.ResultSet interface */
-public interface IDatabricksResultSet {
+public interface IDatabricksResultSet extends ResultSet {
 
   /**
    * Returns statement-Id of associated statement

src/main/java/com/databricks/jdbc/api/IDatabricksStatement.java

@@ -2,9 +2,10 @@
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.sql.Statement;
 
 /** Interface for Databricks specific statement. */
-public interface IDatabricksStatement {
+public interface IDatabricksStatement extends Statement {
 
   /**
    * Executes the given SQL command in async mode, and returns a lightweight instance of result set

src/main/java/com/databricks/jdbc/api/impl/DatabricksConnection.java

@@ -28,7 +28,7 @@
 import java.util.stream.Collectors;
 
 /** Implementation for Databricks specific connection. */
-public class DatabricksConnection implements IDatabricksConnection, Connection {
+public class DatabricksConnection implements IDatabricksConnection {
   private static final JdbcLogger LOGGER = JdbcLoggerFactory.getLogger(DatabricksConnection.class);
   private final IDatabricksSession session;
   private final Set<IDatabricksStatementInternal> statementSet = ConcurrentHashMap.newKeySet();

src/main/java/com/databricks/jdbc/api/impl/DatabricksResultSet.java

@@ -38,8 +38,7 @@
 import java.util.function.Supplier;
 import org.apache.http.entity.InputStreamEntity;
 
-public class DatabricksResultSet
-    implements ResultSet, IDatabricksResultSet, IDatabricksResultSetInternal {
+public class DatabricksResultSet implements IDatabricksResultSet, IDatabricksResultSetInternal {
 
   private static final JdbcLogger LOGGER = JdbcLoggerFactory.getLogger(DatabricksResultSet.class);
   protected static final String AFFECTED_ROWS_COUNT = "num_affected_rows";

src/main/java/com/databricks/jdbc/api/impl/DatabricksStatement.java

@@ -27,8 +27,7 @@
 import java.util.concurrent.*;
 import org.apache.http.entity.InputStreamEntity;
 
-public class DatabricksStatement
-    implements IDatabricksStatement, IDatabricksStatementInternal, Statement {
+public class DatabricksStatement implements IDatabricksStatement, IDatabricksStatementInternal {
 
   private static final JdbcLogger LOGGER = JdbcLoggerFactory.getLogger(DatabricksStatement.class);
   private int timeoutInSeconds;