improved sql parser.

src/main/java/com/alibaba/druid/sql/ast/SQLObjectImpl.java

@@ -190,7 +190,12 @@ public abstract class SQLObjectImpl implements SQLObject {
     }
     
     public boolean hasBeforeComment() {
-        List<String> comments = getBeforeCommentsDirect();
+        if (attributes == null) {
+            return false;
+        }
+
+        List<String> comments = (List<String>) attributes.get("format.before_comment");
+
         if (comments == null) {
             return false;
         }

src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateExpr.java

@@ -22,7 +22,6 @@ import java.util.List;
 import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.*;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
-import com.alibaba.druid.util.FnvHash.Constants;
 import com.alibaba.druid.util.FnvHash;
 
 public class SQLAggregateExpr extends SQLExprImpl implements Serializable, SQLReplaceable {

src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java

@@ -52,7 +52,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleUnique;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleUsingIndexClause;
 import com.alibaba.druid.sql.parser.*;
 import com.alibaba.druid.util.FnvHash;
-import com.alibaba.druid.util.FnvHash.Constants;
 import com.alibaba.druid.util.JdbcConstants;
 
 public class OracleExprParser extends SQLExprParser {

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleToMySqlOutputVisitor.java

@@ -28,7 +28,6 @@ import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLTableSource;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
 import com.alibaba.druid.util.FnvHash;
-import com.alibaba.druid.util.FnvHash.Constants;
 
 public class OracleToMySqlOutputVisitor extends OracleOutputVisitor {
 

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -45,7 +45,6 @@ import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
 import com.alibaba.druid.sql.ast.statement.SQLUnique;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
 import com.alibaba.druid.util.FnvHash;
-import com.alibaba.druid.util.FnvHash.Constants;
 import com.alibaba.druid.util.JdbcConstants;
 
 public class SQLExprParser extends SQLParser {

src/main/java/com/alibaba/druid/util/FnvHash.java

@@ -36,7 +36,19 @@ public final class FnvHash {
         return hash;
     }
 
+    public static long fnv1a_64(char[] chars) {
+        if (chars == null) {
+            return 0;
+        }
+        long hash = BASIC;
+        for (int i = 0; i < chars.length; ++i) {
+            char c = chars[i];
+            hash ^= c;
+            hash *= PRIME;
+        }
 
+        return hash;
+    }
 
     /**
      * lower & normalized & fnv_1a_64