diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertStatement.java
index 5fcd270188..b3d5f77a6d 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertStatement.java
@@ -24,7 +24,6 @@ import com.alibaba.druid.sql.ast.SQLObject;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
-import oracle.sql.SQLUtil;
 
 public class SQLInsertStatement extends SQLInsertInto implements SQLStatement {
     protected SQLWithSubqueryClause with;
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSelectQueryBlock.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSelectQueryBlock.java
index f31de05295..f632f29e0f 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSelectQueryBlock.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSelectQueryBlock.java
@@ -27,7 +27,6 @@ import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 import com.alibaba.druid.util.JdbcConstants;
-import oracle.sql.SQLUtil;
 
 public class MySqlSelectQueryBlock extends SQLSelectQueryBlock implements MySqlObject {
     private boolean              hignPriority;
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/transform/FromSubqueryResolver.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/transform/FromSubqueryResolver.java
index 4638f3b789..2d1d4c9f4f 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/transform/FromSubqueryResolver.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/transform/FromSubqueryResolver.java
@@ -21,11 +21,9 @@ import com.alibaba.druid.sql.ast.SQLObject;
 import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.*;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectJoin;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectSubqueryTableSource;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectTableReference;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitorAdapter;
-import oracle.sql.SQLName;
 
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
index c321ac626f..07ca4fd4ba 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
@@ -46,7 +46,6 @@ import com.alibaba.druid.sql.dialect.oracle.parser.OracleFunctionDataType;
 import com.alibaba.druid.sql.dialect.oracle.parser.OracleProcedureDataType;
 import com.alibaba.druid.util.JdbcConstants;
 import com.alibaba.druid.util.JdbcUtils;
-import oracle.sql.SQLUtil;
 
 import static com.alibaba.druid.util.Utils.getBoolean;
 
diff --git a/src/main/java/com/alibaba/druid/wall/WallProviderStatLoggerImpl.java b/src/main/java/com/alibaba/druid/wall/WallProviderStatLoggerImpl.java
index d6180c708a..2dcb7c3a55 100644
--- a/src/main/java/com/alibaba/druid/wall/WallProviderStatLoggerImpl.java
+++ b/src/main/java/com/alibaba/druid/wall/WallProviderStatLoggerImpl.java
@@ -25,7 +25,7 @@ import com.alibaba.druid.support.logging.LogFactory;
 
 public class WallProviderStatLoggerImpl extends WallProviderStatLoggerAdapter implements WallProviderStatLogger {
 
-    private static Log LOG    = LogFactory.getLog(DruidDataSourceStatLoggerImpl.class);
+    private static Log LOG    = LogFactory.getLog(WallProviderStatLoggerImpl.class);
 
     private Log        logger = LOG;
 
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParamTest.java b/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParamTest.java
index 3ec04e74e1..8f3e0e93a5 100644
--- a/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParamTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParamTest.java
@@ -6,6 +6,9 @@ import com.alibaba.druid.util.FnvHash;
 import com.alibaba.druid.util.JdbcConstants;
 import junit.framework.TestCase;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class MySqlParamTest extends TestCase {
     public final static String dbType = JdbcConstants.MYSQL;
 
@@ -15,10 +18,12 @@ public class MySqlParamTest extends TestCase {
         long hash2 = FnvHash.fnv1a_64_lower(ParameterizedOutputVisitorUtils.parameterize(sql, dbType));
         assertEquals(hash1, hash2);
 
+
         SQLSelectListCache cache = new SQLSelectListCache(dbType);
         cache.add("select `miller_cart`.`CART_ID`,`miller_cart`.`SKU_ID`,`miller_cart`.`ITEM_ID`,`miller_cart`.`QUANTITY`,`miller_cart`.`USER_ID`,`miller_cart`.`SELLER_ID`,`miller_cart`.`STATUS`,`miller_cart`.`EXT_STATUS`,`miller_cart`.`TYPE`,`miller_cart`.`SUB_TYPE`,`miller_cart`.`GMT_CREATE`,`miller_cart`.`GMT_MODIFIED`,`miller_cart`.`ATTRIBUTE`,`miller_cart`.`ATTRIBUTE_CC`,`miller_cart`.`EX2` from");
 
-        long hash3 = ParameterizedOutputVisitorUtils.parameterizeHash(sql, dbType, cache, null);
+        List<Object> outParameters = new ArrayList<Object>(); // 这个参数如果为null时，性能会进一步提升
+        long hash3 = ParameterizedOutputVisitorUtils.parameterizeHash(sql, dbType, cache, outParameters);
         assertEquals(hash1, hash3);
     }
 }
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest88_bindvar.java b/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest88_bindvar.java
index d71ffe2df4..aeee9182f0 100644
--- a/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest88_bindvar.java
+++ b/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest88_bindvar.java
@@ -58,7 +58,7 @@ public class OracleSelectTest88_bindvar extends OracleTest {
                     "FROM (\n" +
                     "\tSELECT *\n" +
                     "\tFROM \"rme\" \"rm\"\n" +
-                    "\tWHERE \"rm\".a - (:\"sys_b_07\") DAY(:\"sys_b_08\") TO SECOND(:\"sys_b_09\")\n" +
+                    "\tWHERE \"rm\".a - INTERVAL :\"sys_b_07\" DAY(:\"sys_b_08\") TO SECOND(:\"sys_b_09\")\n" +
                     ")", text);
         }